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# parallel.apps.launcher

## Module: `parallel.apps.launcher`

Inheritance diagram for `IPython.parallel.apps.launcher`:

Facilities for launching IPython processes asynchronously.

Authors:

- Brian Granger
- MinRK

## Classes

### `BaseLauncher`

class `IPython.parallel.apps.launcher.``BaseLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.config.configurable.LoggingConfigurable`

  An asbtraction for starting, stopping and signaling a process.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()

    The `.args` property calls this to find the args list.

    Subcommand should implement this to construct the cmd and args.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`()

    Start the process.

  `start_data`
  `stop`()

    Stop the process and notify observers of stopping.

    This method will return None immediately. To observe the actual process stopping, see `on_stop()`.

  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `BatchClusterAppMixin`

class `IPython.parallel.apps.launcher.``BatchClusterAppMixin`(**kw)

  Bases: `IPython.parallel.apps.launcher.ClusterAppMixin`

  ClusterApp mixin that updates the self.context dict, rather than cl-args.

  `__init__`(**kw)
  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `profile_dir`

    A trait for unicode strings.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

### `BatchSystemLauncher`

class `IPython.parallel.apps.launcher.``BatchSystemLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.BaseLauncher`

  Launch an external process using a batch system.

  This class is designed to work with UNIX batch systems like PBS, LSF, GridEngine, etc. The overall model is that there are different commands like qsub, qdel, etc. that handle the starting and stopping of the process.

  This class also has the notion of a batch script. The `batch_template` attribute can be set to a string that is a template for the batch script. This template is instantiated using string formatting. Thus the template can use {n} fot the number of instances. Subclasses can add additional variables to the template dict.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n copies of the process using a batch system.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `ClusterAppMixin`

class `IPython.parallel.apps.launcher.``ClusterAppMixin`(**kw)

  Bases: `IPython.utils.traitlets.HasTraits`

  MixIn for cluster args as traits

  `__init__`(**kw)
  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `profile_dir`

    A trait for unicode strings.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

### `ControllerMixin`

class `IPython.parallel.apps.launcher.``ControllerMixin`(**kw)

  Bases: `IPython.parallel.apps.launcher.ClusterAppMixin`

  `__init__`(**kw)
  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `controller_args`

    An instance of a Python list.

  `controller_cmd`

    An instance of a Python list.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `profile_dir`

    A trait for unicode strings.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

### `DeprecatedMPILauncher`

class `IPython.parallel.apps.launcher.``DeprecatedMPILauncher`

  Bases: `object`

  `__init__`()

    x.__init__(...) initializes x; see help(type(x)) for signature

  `warn`()

### `EngineMixin`

class `IPython.parallel.apps.launcher.``EngineMixin`(**kw)

  Bases: `IPython.parallel.apps.launcher.ClusterAppMixin`

  `__init__`(**kw)
  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `profile_dir`

    A trait for unicode strings.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

### `IPClusterLauncher`

class `IPython.parallel.apps.launcher.``IPClusterLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalProcessLauncher`

  Launch the ipcluster program in an external process.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `ipcluster_args`

    An instance of a Python list.

  `ipcluster_cmd`

    An instance of a Python list.

  `ipcluster_n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `ipcluster_subcommand`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `running`

    Am I running.

  `signal`(sig)
  `start`()
  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `LSFControllerLauncher`

class `IPython.parallel.apps.launcher.``LSFControllerLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LSFLauncher`, `IPython.parallel.apps.launcher.BatchClusterAppMixin`

  Launch a controller using LSF.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`()

    Start the controller by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `LSFEngineSetLauncher`

class `IPython.parallel.apps.launcher.``LSFEngineSetLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LSFLauncher`, `IPython.parallel.apps.launcher.BatchClusterAppMixin`

  Launch Engines using LSF

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n engines by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `LSFLauncher`

class `IPython.parallel.apps.launcher.``LSFLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.BatchSystemLauncher`

  A BatchSystemLauncher subclass for LSF.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n copies of the process using LSF batch system. This cant inherit from the base class because bsub expects to be piped a shell script in order to honor the #BSUB directives : bsub < script

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `LauncherError`

class `IPython.parallel.apps.launcher.``LauncherError`

  Bases: `exceptions.Exception`

  `__init__`()

    x.__init__(...) initializes x; see help(type(x)) for signature

  `args`
  `message`

### `LocalControllerLauncher`

class `IPython.parallel.apps.launcher.``LocalControllerLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalProcessLauncher`, `IPython.parallel.apps.launcher.ControllerMixin`

  Launch a controller as a regular external process.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `controller_args`

    An instance of a Python list.

  `controller_cmd`

    An instance of a Python list.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)
  `start`()

    Start the controller by profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `LocalEngineLauncher`

class `IPython.parallel.apps.launcher.``LocalEngineLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalProcessLauncher`, `IPython.parallel.apps.launcher.EngineMixin`

  Launch a single engine as a regular externall process.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)
  `start`()
  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `LocalEngineSetLauncher`

class `IPython.parallel.apps.launcher.``LocalEngineSetLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalEngineLauncher`

  Launch a set of engines as regular external processes.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `delay`

    A casting version of the float trait.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=1.0)
  `launcher_class`

    alias of `LocalEngineLauncher`

  `launchers`

    An instance of a Python dict.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)
  `start`(n)

    Start n engines by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`

    An instance of a Python dict.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `LocalProcessLauncher`

class `IPython.parallel.apps.launcher.``LocalProcessLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.BaseLauncher`

  Start and stop an external process in an asynchronous manner.

  This will launch the external process with a working directory of `self.work_dir`.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `running`

    Am I running.

  `signal`(sig)
  `start`()
  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `MPIControllerLauncher`

class `IPython.parallel.apps.launcher.``MPIControllerLauncher`(*args, **kwargs)

  Bases: `IPython.parallel.apps.launcher.MPILauncher`, `IPython.parallel.apps.launcher.ControllerMixin`

  Launch a controller using mpiexec.

  `__init__`(*args, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `controller_args`

    An instance of a Python list.

  `controller_cmd`

    An instance of a Python list.

  `find_args`()

    Build self.args using all the fields.

  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `mpi_args`

    An instance of a Python list.

  `mpi_cmd`

    An instance of a Python list.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `program`
  `program_args`
  `running`

    Am I running.

  `signal`(sig)
  `start`()

    Start the controller by profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `MPIEngineSetLauncher`

class `IPython.parallel.apps.launcher.``MPIEngineSetLauncher`(*args, **kwargs)

  Bases: `IPython.parallel.apps.launcher.MPILauncher`, `IPython.parallel.apps.launcher.EngineMixin`

  Launch engines using mpiexec

  `__init__`(*args, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `find_args`()

    Build self.args using all the fields.

  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `mpi_args`

    An instance of a Python list.

  `mpi_cmd`

    An instance of a Python list.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `program`
  `program_args`
  `running`

    Am I running.

  `signal`(sig)
  `start`(n)

    Start n engines by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `MPIExecControllerLauncher`

class `IPython.parallel.apps.launcher.``MPIExecControllerLauncher`(*args, **kwargs)

  Bases: `IPython.parallel.apps.launcher.MPIControllerLauncher`, `IPython.parallel.apps.launcher.DeprecatedMPILauncher`

  Deprecated, use MPIControllerLauncher

  `__init__`(*args, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `controller_args`

    An instance of a Python list.

  `controller_cmd`

    An instance of a Python list.

  `find_args`()

    Build self.args using all the fields.

  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `mpi_args`

    An instance of a Python list.

  `mpi_cmd`

    An instance of a Python list.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `program`
  `program_args`
  `running`

    Am I running.

  `signal`(sig)
  `start`()

    Start the controller by profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `warn`()
  `work_dir`

    A trait for unicode strings.

### `MPIExecEngineSetLauncher`

class `IPython.parallel.apps.launcher.``MPIExecEngineSetLauncher`(*args, **kwargs)

  Bases: `IPython.parallel.apps.launcher.MPIEngineSetLauncher`, `IPython.parallel.apps.launcher.DeprecatedMPILauncher`

  Deprecated, use MPIEngineSetLauncher

  `__init__`(*args, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `find_args`()

    Build self.args using all the fields.

  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `mpi_args`

    An instance of a Python list.

  `mpi_cmd`

    An instance of a Python list.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `program`
  `program_args`
  `running`

    Am I running.

  `signal`(sig)
  `start`(n)

    Start n engines by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `warn`()
  `work_dir`

    A trait for unicode strings.

### `MPIExecLauncher`

class `IPython.parallel.apps.launcher.``MPIExecLauncher`(*args, **kwargs)

  Bases: `IPython.parallel.apps.launcher.MPILauncher`, `IPython.parallel.apps.launcher.DeprecatedMPILauncher`

  Deprecated, use MPILauncher

  `__init__`(*args, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()

    Build self.args using all the fields.

  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `mpi_args`

    An instance of a Python list.

  `mpi_cmd`

    An instance of a Python list.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `program`

    An instance of a Python list.

  `program_args`

    An instance of a Python list.

  `running`

    Am I running.

  `signal`(sig)
  `start`(n)

    Start n instances of the program using mpiexec.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `warn`()
  `work_dir`

    A trait for unicode strings.

### `MPILauncher`

class `IPython.parallel.apps.launcher.``MPILauncher`(*args, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalProcessLauncher`

  Launch an external process using mpiexec.

  `__init__`(*args, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()

    Build self.args using all the fields.

  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `mpi_args`

    An instance of a Python list.

  `mpi_cmd`

    An instance of a Python list.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `program`

    An instance of a Python list.

  `program_args`

    An instance of a Python list.

  `running`

    Am I running.

  `signal`(sig)
  `start`(n)

    Start n instances of the program using mpiexec.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `PBSControllerLauncher`

class `IPython.parallel.apps.launcher.``PBSControllerLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.PBSLauncher`, `IPython.parallel.apps.launcher.BatchClusterAppMixin`

  Launch a controller using PBS.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`()

    Start the controller by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `PBSEngineSetLauncher`

class `IPython.parallel.apps.launcher.``PBSEngineSetLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.PBSLauncher`, `IPython.parallel.apps.launcher.BatchClusterAppMixin`

  Launch Engines using PBS

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n engines by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `PBSLauncher`

class `IPython.parallel.apps.launcher.``PBSLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.BatchSystemLauncher`

  A BatchSystemLauncher subclass for PBS.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n copies of the process using a batch system.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `ProcessStateError`

class `IPython.parallel.apps.launcher.``ProcessStateError`

  Bases: `IPython.parallel.apps.launcher.LauncherError`

  `__init__`()

    x.__init__(...) initializes x; see help(type(x)) for signature

  `args`
  `message`

### `SGEControllerLauncher`

class `IPython.parallel.apps.launcher.``SGEControllerLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.SGELauncher`, `IPython.parallel.apps.launcher.BatchClusterAppMixin`

  Launch a controller using SGE.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`()

    Start the controller by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `SGEEngineSetLauncher`

class `IPython.parallel.apps.launcher.``SGEEngineSetLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.SGELauncher`, `IPython.parallel.apps.launcher.BatchClusterAppMixin`

  Launch Engines with SGE

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n engines by profile or profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `SGELauncher`

class `IPython.parallel.apps.launcher.``SGELauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.PBSLauncher`

  Sun GridEngine is a PBS clone with slightly different syntax

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  `batch_file`

    A trait for unicode strings.

  `batch_file_name`

    A trait for unicode strings.

  `batch_template`

    A trait for unicode strings.

  `batch_template_file`

    A trait for unicode strings.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `context`

    An instance of a Python dict.

  `default_template`

    A trait for unicode strings.

  `delete_command`

    An instance of a Python list.

  `find_args`()
  `formatter`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `job_array_regexp`

    A trait for unicode strings.

  `job_array_template`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `n`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `queue`

    A trait for unicode strings.

  `queue_regexp`

    A trait for unicode strings.

  `queue_template`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n copies of the process using a batch system.

  `start_data`
  `stop`()
  `stop_data`
  `submit_command`

    An instance of a Python list.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_batch_script`(n)

    Instantiate and write the batch script to the work_dir.

### `SSHControllerLauncher`

class `IPython.parallel.apps.launcher.``SSHControllerLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.SSHLauncher`, `IPython.parallel.apps.launcher.ControllerMixin`

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `controller_args`

    An instance of a Python list.

  `controller_cmd`

    An instance of a Python list.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `hostname`

    A trait for unicode strings.

  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `location`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `program`
  `program_args`
  `running`

    Am I running.

  `signal`(sig)
  `ssh_args`

    An instance of a Python list.

  `ssh_cmd`

    An instance of a Python list.

  `start`(hostname=None, user=None)
  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `user`

    A trait for unicode strings.

  `work_dir`

    A trait for unicode strings.

### `SSHEngineLauncher`

class `IPython.parallel.apps.launcher.``SSHEngineLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.SSHLauncher`, `IPython.parallel.apps.launcher.EngineMixin`

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `hostname`

    A trait for unicode strings.

  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `location`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `program`
  `program_args`
  `running`

    Am I running.

  `signal`(sig)
  `ssh_args`

    An instance of a Python list.

  `ssh_cmd`

    An instance of a Python list.

  `start`(hostname=None, user=None)
  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `user`

    A trait for unicode strings.

  `work_dir`

    A trait for unicode strings.

### `SSHEngineSetLauncher`

class `IPython.parallel.apps.launcher.``SSHEngineSetLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalEngineSetLauncher`

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `delay`

    A casting version of the float trait.

  `engine_args`

    An instance of a Python list.

  `engine_cmd`

    An instance of a Python list.

  `engine_count`

    determine engine count from engines dict

  `engines`

    An instance of a Python dict.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `interrupt_then_kill`(delay=1.0)
  `launcher_class`

    alias of `SSHEngineLauncher`

  `launchers`

    An instance of a Python dict.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `profile_dir`

    A trait for unicode strings.

  `running`

    Am I running.

  `signal`(sig)
  `start`(n)

    Start engines by profile or profile_dir. n is ignored, and the engines config property is used instead.

  `start_data`
  `stop`()
  `stop_data`

    An instance of a Python dict.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

### `SSHLauncher`

class `IPython.parallel.apps.launcher.``SSHLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.LocalProcessLauncher`

  A minimal launcher for ssh.

  To be useful this will probably have to be extended to use the `sshx` idea for environment variables. There could be other things this needs as well.

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cmd_and_args`

    An instance of a Python list.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()
  `handle_stderr`(fd, events)
  `handle_stdout`(fd, events)
  `hostname`

    A trait for unicode strings.

  `interrupt_then_kill`(delay=2.0)

    Send INT, wait a delay and then send KILL.

  `location`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `poll`()
  `poll_frequency`

    An integer trait.

    Longs that are unnecessary (<= sys.maxint) are cast to ints.

  `program`

    An instance of a Python list.

  `program_args`

    An instance of a Python list.

  `running`

    Am I running.

  `signal`(sig)
  `ssh_args`

    An instance of a Python list.

  `ssh_cmd`

    An instance of a Python list.

  `start`(hostname=None, user=None)
  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `user`

    A trait for unicode strings.

  `work_dir`

    A trait for unicode strings.

### `UnknownStatus`

class `IPython.parallel.apps.launcher.``UnknownStatus`

  Bases: `IPython.parallel.apps.launcher.LauncherError`

  `__init__`()

    x.__init__(...) initializes x; see help(type(x)) for signature

  `args`
  `message`

### `WindowsHPCControllerLauncher`

class `IPython.parallel.apps.launcher.``WindowsHPCControllerLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.WindowsHPCLauncher`, `IPython.parallel.apps.launcher.ClusterAppMixin`

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `controller_args`

    An instance of a Python list.

  `find_args`()
  `job_cmd`

    A trait for unicode strings.

  `job_file`
  `job_file_name`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `running`

    Am I running.

  `scheduler`

    A trait for unicode strings.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`()

    Start the controller by profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_job_file`(n)

### `WindowsHPCEngineSetLauncher`

class `IPython.parallel.apps.launcher.``WindowsHPCEngineSetLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.WindowsHPCLauncher`, `IPython.parallel.apps.launcher.ClusterAppMixin`

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `cluster_args`

    An instance of a Python list.

  `cluster_id`

    A trait for unicode strings.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `engine_args`

    An instance of a Python list.

  `find_args`()
  `job_cmd`

    A trait for unicode strings.

  `job_file`
  `job_file_name`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `profile_dir`

    A trait for unicode strings.

  `running`

    Am I running.

  `scheduler`

    A trait for unicode strings.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start the controller by profile_dir.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_job_file`(n)

### `WindowsHPCLauncher`

class `IPython.parallel.apps.launcher.``WindowsHPCLauncher`(work_dir=u'.', config=None, **kwargs)

  Bases: `IPython.parallel.apps.launcher.BaseLauncher`

  `__init__`(work_dir=u'.', config=None, **kwargs)
  `arg_str`

    The string form of the program arguments.

  `args`

    A list of cmd and args that will be used to start the process.

    This is what is passed to `spawnProcess()` and the first element will be the process name.

  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`(inst=None)

    Get the help string for this class in ReST format.

    If inst is given, it’s current trait values will be used in place of class defaults.

  classmethod `class_get_trait_help`(trait, inst=None)

    Get the help string for a single trait.

    If inst is given, it’s current trait values will be used in place of the class default.

  classmethod `class_print_help`(inst=None)

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `find_args`()
  `job_cmd`

    A trait for unicode strings.

  `job_file`
  `job_file_name`

    A trait for unicode strings.

  `job_id_regexp`

    A trait for unicode strings.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `notify_start`(data)

    Call this to trigger startup actions.

    This logs the process startup and sets the state to ‘running’. It is a pass-through so it can be used as a callback.

  `notify_stop`(data)

    Call this to trigger process stop actions.

    This logs the process stopping and sets the state to ‘after’. Call this to trigger callbacks registered via `on_stop()`.

  `on_stop`(f)

    Register a callback to be called with this Launcher’s stop_data when the process actually finishes.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters : | handler : callable A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new). name : list, str, None If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name. remove : bool If False (the default), then install the handler. If True then unintall it.

  `parse_job_id`(output)

    Take the output of the submit command and return the job id.

  `running`

    Am I running.

  `scheduler`

    A trait for unicode strings.

  `signal`(sig)

    Signal the process.

    Parameters : | sig : str or int ‘KILL’, ‘INT’, etc., or any signal number

  `start`(n)

    Start n copies of the process using the Win HPC job scheduler.

  `start_data`
  `stop`()
  `stop_data`
  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `update_config`(config)

    Fire the traits events when the config is updated.

  `work_dir`

    A trait for unicode strings.

  `write_job_file`(n)

## Function

`IPython.parallel.apps.launcher.``find_job_cmd`()

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