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# parallel.engine.streamkernel

## Module: `parallel.engine.streamkernel`

Inheritance diagram for `IPython.parallel.engine.streamkernel`:

Kernel adapted from kernel.py to use ZMQ Streams

Authors:

- Min RK
- Brian Granger
- Fernando Perez
- Evan Patterson

## `Kernel`

class `IPython.parallel.engine.streamkernel.``Kernel`(**kwargs)

  Bases: `IPython.zmq.session.SessionFactory`

  `__init__`(**kwargs)
  `abort_queue`(stream)
  `abort_queues`()
  `abort_request`(stream, ident, parent)

    abort a specifig msg by id

  `aborted`

    An instance of a Python set.

  `apply_request`(stream, ident, parent)
  `bident`

    A casting version of the byte string trait.

  `check_aborted`(msg_id)
  `check_dependencies`(dependencies)
  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.

  `clear_request`(stream, idents, parent)

    Clear our namespace.

  `client`

    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.

  `compiler`

    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.

  `complete`(msg)
  `complete_request`(stream, ident, parent)
  `completer`

    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.

  `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`

    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.

  `control_handlers`

    An instance of a Python dict.

  `control_stream`

    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.

  `dispatch_control`(msg)
  `dispatch_queue`(stream, msg)
  `exec_lines`

    An instance of a Python list.

  `execute_request`(stream, ident, parent)
  `ident`

    A trait for unicode strings.

  `int_id`

    An integer trait.

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

  `iopub_stream`

    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.

  `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.

  `logname`

    A trait for unicode strings.

  `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.

  `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.

  `session`

    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.

  `shell_handlers`

    An instance of a Python dict.

  `shell_streams`

    An instance of a Python list.

  `shutdown_request`(stream, ident, parent)

    kill ourself. This should really be handled in an external process

  `start`()
  `task_stream`

    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.

  `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_ns`

    An instance of a Python dict.

`IPython.parallel.engine.streamkernel.``printer`(*args)

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