Docstring cleanup for kernelmanagers and channels.

We have decided to put the docstrings on the base implementations
in IPython.zmq.kernelmanager.  The ABCs in
IPython.zmq.kernelmanager.abc and implementation in
IPython.inprocess.kernelmanager point to this location.

IPython/inprocess/kernelmanager.py

@@ -1,453 +1,313 b''
 """ A kernel manager for in-process kernels. """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2012  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Local imports.
 from IPython.config.configurable import Configurable
 from IPython.inprocess.socket import DummySocket
 from IPython.utils.traitlets import Any, Instance, Type
 from IPython.zmq.kernelmanagerabc import (
     ShellChannelABC, IOPubChannelABC,
     HBChannelABC, StdInChannelABC,
     KernelManagerABC
 )
 
 #-----------------------------------------------------------------------------
 # Channel classes
 #-----------------------------------------------------------------------------
 
 class InProcessChannel(object):
-    """ Base class for in-process channels.
-    """
+    """Base class for in-process channels."""
 
     def __init__(self, manager):
         super(InProcessChannel, self).__init__()
         self.manager = manager
         self._is_alive = False
 
     #--------------------------------------------------------------------------
     # Channel interface
     #--------------------------------------------------------------------------
 
     def is_alive(self):
         return self._is_alive
 
     def start(self):
         self._is_alive = True
 
     def stop(self):
         self._is_alive = False
 
     def call_handlers(self, msg):
         """ This method is called in the main thread when a message arrives.
 
         Subclasses should override this method to handle incoming messages.
         """
         raise NotImplementedError('call_handlers must be defined in a subclass.')
 
     #--------------------------------------------------------------------------
     # InProcessChannel interface
     #--------------------------------------------------------------------------
 
     def call_handlers_later(self, *args, **kwds):
         """ Call the message handlers later.
 
         The default implementation just calls the handlers immediately, but this
         method exists so that GUI toolkits can defer calling the handlers until
         after the event loop has run, as expected by GUI frontends.
         """
         self.call_handlers(*args, **kwds)
 
     def process_events(self):
         """ Process any pending GUI events.
 
         This method will be never be called from a frontend without an event
         loop (e.g., a terminal frontend).
         """
         raise NotImplementedError
 
 
 class InProcessShellChannel(InProcessChannel):
-    """The DEALER channel for issues request/replies to the kernel.
-    """
+    """See `IPython.zmq.kernelmanager.ShellChannel` for docstrings."""
 
     # flag for whether execute requests should be allowed to call raw_input
     allow_stdin = True
 
     #--------------------------------------------------------------------------
     # ShellChannel interface
     #--------------------------------------------------------------------------
 
     def execute(self, code, silent=False, store_history=True,
                 user_variables=[], user_expressions={}, allow_stdin=None):
-        """Execute code in the kernel.
-
-        Parameters
-        ----------
-        code : str
-            A string of Python code.
-
-        silent : bool, optional (default False)
-            If set, the kernel will execute the code as quietly possible, and
-            will force store_history to be False.
-
-        store_history : bool, optional (default True)
-            If set, the kernel will store command history.  This is forced
-            to be False if silent is True.
-
-        user_variables : list, optional
-            A list of variable names to pull from the user's namespace.  They
-            will come back as a dict with these names as keys and their
-            :func:`repr` as values.
-
-        user_expressions : dict, optional
-            A dict mapping names to expressions to be evaluated in the user's
-            dict. The expression values are returned as strings formatted using
-            :func:`repr`.
-
-        allow_stdin : bool, optional (default self.allow_stdin)
-            Flag for whether the kernel can send stdin requests to frontends.
-
-            Some frontends (e.g. the Notebook) do not support stdin requests. 
-            If raw_input is called from code executed from such a frontend, a
-            StdinNotImplementedError will be raised.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         if allow_stdin is None:
             allow_stdin = self.allow_stdin
         content = dict(code=code, silent=silent, store_history=store_history,
                        user_variables=user_variables,
                        user_expressions=user_expressions,
                        allow_stdin=allow_stdin)
         msg = self.manager.session.msg('execute_request', content)
         self._dispatch_to_kernel(msg)
         return msg['header']['msg_id']
 
     def complete(self, text, line, cursor_pos, block=None):
-        """Tab complete text in the kernel's namespace.
-
-        Parameters
-        ----------
-        text : str
-            The text to complete.
-        line : str
-            The full line of text that is the surrounding context for the
-            text to complete.
-        cursor_pos : int
-            The position of the cursor in the line where the completion was
-            requested.
-        block : str, optional
-            The full block of code in which the completion is being requested.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         content = dict(text=text, line=line, block=block, cursor_pos=cursor_pos)
         msg = self.manager.session.msg('complete_request', content)
         self._dispatch_to_kernel(msg)
         return msg['header']['msg_id']
 
     def object_info(self, oname, detail_level=0):
-        """Get metadata information about an object.
-
-        Parameters
-        ----------
-        oname : str
-            A string specifying the object name.
-        detail_level : int, optional
-            The level of detail for the introspection (0-2)
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         content = dict(oname=oname, detail_level=detail_level)
         msg = self.manager.session.msg('object_info_request', content)
         self._dispatch_to_kernel(msg)
         return msg['header']['msg_id']
 
     def history(self, raw=True, output=False, hist_access_type='range', **kwds):
-        """Get entries from the history list.
-
-        Parameters
-        ----------
-        raw : bool
-            If True, return the raw input.
-        output : bool
-            If True, then return the output as well.
-        hist_access_type : str
-            'range' (fill in session, start and stop params), 'tail' (fill in n)
-             or 'search' (fill in pattern param).
-
-        session : int
-            For a range request, the session from which to get lines. Session
-            numbers are positive integers; negative ones count back from the
-            current session.
-        start : int
-            The first line number of a history range.
-        stop : int
-            The final (excluded) line number of a history range.
-
-        n : int
-            The number of lines of history to get for a tail request.
-
-        pattern : str
-            The glob-syntax pattern for a search request.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         content = dict(raw=raw, output=output,
                        hist_access_type=hist_access_type, **kwds)
         msg = self.manager.session.msg('history_request', content)
         self._dispatch_to_kernel(msg)
         return msg['header']['msg_id']
 
     def shutdown(self, restart=False):
-        """ Request an immediate kernel shutdown.
-
-        A dummy method for the in-process kernel.
-        """
         # FIXME: What to do here?
         raise NotImplementedError('Cannot shutdown in-process kernel')
 
     #--------------------------------------------------------------------------
     # Protected interface
     #--------------------------------------------------------------------------
 
     def _dispatch_to_kernel(self, msg):
         """ Send a message to the kernel and handle a reply.
         """
         kernel = self.manager.kernel
         if kernel is None:
             raise RuntimeError('Cannot send request. No kernel exists.')
 
         stream = DummySocket()
         self.manager.session.send(stream, msg)
         msg_parts = stream.recv_multipart()
         kernel.dispatch_shell(stream, msg_parts)
 
         idents, reply_msg = self.manager.session.recv(stream, copy=False)
         self.call_handlers_later(reply_msg)
 
 
 class InProcessIOPubChannel(InProcessChannel):
-    """The SUB channel which listens for messages that the kernel publishes. 
-    """
+    """See `IPython.zmq.kernelmanager.IOPubChannel` for docstrings."""
 
     def flush(self, timeout=1.0):
-        """ Immediately processes all pending messages on the SUB channel.
-
-        A dummy method for the in-process kernel.
-        """
         pass
 
 
 class InProcessStdInChannel(InProcessChannel):
-    """ A reply channel to handle raw_input requests that the kernel makes. """
+    """See `IPython.zmq.kernelmanager.StdInChannel` for docstrings."""
 
     def input(self, string):
-        """ Send a string of raw input to the kernel. 
-        """
         kernel = self.manager.kernel
         if kernel is None:
             raise RuntimeError('Cannot send input reply. No kernel exists.')
         kernel.raw_input_str = string
 
 
 class InProcessHBChannel(InProcessChannel):
-    """ A dummy heartbeat channel. """
+    """See `IPython.zmq.kernelmanager.HBChannel` for docstrings."""
 
     time_to_dead = 3.0
 
     def __init__(self, *args, **kwds):
         super(InProcessHBChannel, self).__init__(*args, **kwds)
         self._pause = True
 
     def pause(self):
-        """ Pause the heartbeat. """
         self._pause = True
 
     def unpause(self):
-        """ Unpause the heartbeat. """
         self._pause = False
 
     def is_beating(self):
-        """ Is the heartbeat running and responsive (and not paused). """
         return not self._pause
 
 
 #-----------------------------------------------------------------------------
 # Main kernel manager class
 #-----------------------------------------------------------------------------
 
 class InProcessKernelManager(Configurable):
     """ A manager for an in-process kernel.
 
-    This class implements most of the interface of
-    ``IPython.zmq.kernelmanager.KernelManager`` and allows (asynchronous)
-    frontends to be used seamlessly with an in-process kernel.
+    This class implements the interface of
+    `IPython.zmq.kernelmanagerabc.KernelManagerABC` and allows
+    (asynchronous) frontends to be used seamlessly with an in-process kernel.
+    
+    See `IPython.zmq.kernelmanager.KernelManager` for docstrings.
     """
 
     # The Session to use for building messages.
     session = Instance('IPython.zmq.session.Session')
     def _session_default(self):
         from IPython.zmq.session import Session
         return Session(config=self.config)
 
     # The kernel process with which the KernelManager is communicating.
     kernel = Instance('IPython.inprocess.ipkernel.InProcessKernel')
 
     # The classes to use for the various channels.
     shell_channel_class = Type(InProcessShellChannel)
     iopub_channel_class = Type(InProcessIOPubChannel)
     stdin_channel_class = Type(InProcessStdInChannel)
     hb_channel_class = Type(InProcessHBChannel)
 
     # Protected traits.
     _shell_channel = Any
     _iopub_channel = Any
     _stdin_channel = Any
     _hb_channel = Any
 
     #--------------------------------------------------------------------------
     # Channel management methods.
     #--------------------------------------------------------------------------
 
     def start_channels(self, shell=True, iopub=True, stdin=True, hb=True):
-        """ Starts the channels for this kernel.
-        """
         if shell:
             self.shell_channel.start()
         if iopub:
             self.iopub_channel.start()
         if stdin:
             self.stdin_channel.start()
             self.shell_channel.allow_stdin = True
         else:
             self.shell_channel.allow_stdin = False
         if hb:
             self.hb_channel.start()
 
     def stop_channels(self):
-        """ Stops all the running channels for this kernel.
-        """
         if self.shell_channel.is_alive():
             self.shell_channel.stop()
         if self.iopub_channel.is_alive():
             self.iopub_channel.stop()
         if self.stdin_channel.is_alive():
             self.stdin_channel.stop()
         if self.hb_channel.is_alive():
             self.hb_channel.stop()
 
     @property
     def channels_running(self):
-        """ Are any of the channels created and running? """
         return (self.shell_channel.is_alive() or self.iopub_channel.is_alive() or
                 self.stdin_channel.is_alive() or self.hb_channel.is_alive())
 
     @property
     def shell_channel(self):
-        """Get the REQ socket channel object to make requests of the kernel."""
         if self._shell_channel is None:
             self._shell_channel = self.shell_channel_class(self)
         return self._shell_channel
 
     @property
     def iopub_channel(self):
-        """Get the SUB socket channel object."""
         if self._iopub_channel is None:
             self._iopub_channel = self.iopub_channel_class(self)
         return self._iopub_channel
 
     @property
     def stdin_channel(self):
-        """Get the REP socket channel object to handle stdin (raw_input)."""
         if self._stdin_channel is None:
             self._stdin_channel = self.stdin_channel_class(self)
         return self._stdin_channel
 
     @property
     def hb_channel(self):
-        """Get the heartbeat socket channel object to check that the
-        kernel is alive."""
         if self._hb_channel is None:
             self._hb_channel = self.hb_channel_class(self)
         return self._hb_channel
 
     #--------------------------------------------------------------------------
     # Kernel management methods:
     #--------------------------------------------------------------------------
     
     def start_kernel(self, **kwds):
-        """ Starts a kernel process and configures the manager to use it.
-        """
         from IPython.inprocess.ipkernel import InProcessKernel
         self.kernel = InProcessKernel()
         self.kernel.frontends.append(self)
 
     def shutdown_kernel(self):
-        """ Attempts to the stop the kernel process cleanly. If the kernel
-        cannot be stopped and the kernel is local, it is killed.
-        """
         self.kill_kernel()
 
     def restart_kernel(self, now=False, **kwds):
-        """ Restarts a kernel with the arguments that were used to launch it.
-
-        The 'now' parameter is ignored.
-        """
         self.shutdown_kernel()
         self.start_kernel(**kwds)
 
     @property
     def has_kernel(self):
-        """ Returns whether a kernel process has been specified for the kernel
-        manager.
-        """
         return self.kernel is not None
 
     def kill_kernel(self):
-        """ Kill the running kernel. 
-        """
         self.kernel.frontends.remove(self)
         self.kernel = None
 
     def interrupt_kernel(self):
-        """ Interrupts the kernel. """
         raise NotImplementedError("Cannot interrupt in-process kernel.")
 
     def signal_kernel(self, signum):
-        """ Sends a signal to the kernel. """
         raise NotImplementedError("Cannot signal in-process kernel.")
 
     @property
     def is_alive(self):
-        """ Is the kernel process still running? """
         return True
 
 
 #-----------------------------------------------------------------------------
 # ABC Registration
 #-----------------------------------------------------------------------------
 
 ShellChannelABC.register(InProcessShellChannel)
 IOPubChannelABC.register(InProcessIOPubChannel)
 HBChannelABC.register(InProcessHBChannel)
 StdInChannelABC.register(InProcessStdInChannel)
 KernelManagerABC.register(InProcessKernelManager)

IPython/zmq/kernelmanagerabc.py

@@ -1,401 +1,229 b''
 """Abstract base classes for kernel manager and channels."""
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2013  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Standard library imports.
 import abc
 
 #-----------------------------------------------------------------------------
 # Channels
 #-----------------------------------------------------------------------------
 
 
 class ChannelABC(object):
     """A base class for all channel ABCs."""
 
     __metaclass__ = abc.ABCMeta
 
     @abc.abstractmethod
     def start(self):
         pass
 
     @abc.abstractmethod
     def stop(self):
         pass
 
     @abc.abstractmethod
     def is_alive(self):
         pass
 
 
 class ShellChannelABC(ChannelABC):
-    """The DEALER channel for issues request/replies to the kernel.
+    """ShellChannel ABC.
+
+    The docstrings for this class can be found in the base implementation:
+
+    `IPython.zmq.kernelmanager.ShellChannel`
     """
 
     @abc.abstractproperty
     def allow_stdin(self):
         pass
 
     @abc.abstractmethod
     def execute(self, code, silent=False, store_history=True,
                 user_variables=None, user_expressions=None, allow_stdin=None):
-        """Execute code in the kernel.
-
-        Parameters
-        ----------
-        code : str
-            A string of Python code.
-
-        silent : bool, optional (default False)
-            If set, the kernel will execute the code as quietly possible, and
-            will force store_history to be False.
-
-        store_history : bool, optional (default True)
-            If set, the kernel will store command history.  This is forced
-            to be False if silent is True.
-
-        user_variables : list, optional
-            A list of variable names to pull from the user's namespace.  They
-            will come back as a dict with these names as keys and their
-            :func:`repr` as values.
-
-        user_expressions : dict, optional
-            A dict mapping names to expressions to be evaluated in the user's
-            dict. The expression values are returned as strings formatted using
-            :func:`repr`.
-
-        allow_stdin : bool, optional (default self.allow_stdin)
-            Flag for whether the kernel can send stdin requests to frontends.
-
-            Some frontends (e.g. the Notebook) do not support stdin requests. 
-            If raw_input is called from code executed from such a frontend, a
-            StdinNotImplementedError will be raised.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         pass
 
     @abc.abstractmethod
     def complete(self, text, line, cursor_pos, block=None):
-        """Tab complete text in the kernel's namespace.
-
-        Parameters
-        ----------
-        text : str
-            The text to complete.
-        line : str
-            The full line of text that is the surrounding context for the
-            text to complete.
-        cursor_pos : int
-            The position of the cursor in the line where the completion was
-            requested.
-        block : str, optional
-            The full block of code in which the completion is being requested.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         pass
 
     @abc.abstractmethod
     def object_info(self, oname, detail_level=0):
-        """Get metadata information about an object.
-
-        Parameters
-        ----------
-        oname : str
-            A string specifying the object name.
-        detail_level : int, optional
-            The level of detail for the introspection (0-2)
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         pass
 
     @abc.abstractmethod
     def history(self, raw=True, output=False, hist_access_type='range', **kwargs):
-        """Get entries from the history list.
-
-        Parameters
-        ----------
-        raw : bool
-            If True, return the raw input.
-        output : bool
-            If True, then return the output as well.
-        hist_access_type : str
-            'range' (fill in session, start and stop params), 'tail' (fill in n)
-             or 'search' (fill in pattern param).
-
-        session : int
-            For a range request, the session from which to get lines. Session
-            numbers are positive integers; negative ones count back from the
-            current session.
-        start : int
-            The first line number of a history range.
-        stop : int
-            The final (excluded) line number of a history range.
-
-        n : int
-            The number of lines of history to get for a tail request.
-
-        pattern : str
-            The glob-syntax pattern for a search request.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
         pass
 
     @abc.abstractmethod
     def kernel_info(self):
-        """Request kernel info."""
         pass
 
     @abc.abstractmethod
     def shutdown(self, restart=False):
-        """Request an immediate kernel shutdown.
-
-        Upon receipt of the (empty) reply, client code can safely assume that
-        the kernel has shut down and it's safe to forcefully terminate it if
-        it's still alive.
-
-        The kernel will send the reply via a function registered with Python's
-        atexit module, ensuring it's truly done as the kernel is done with all
-        normal operation.
-        """
         pass
 
 
 class IOPubChannelABC(ChannelABC):
-    """The SUB channel which listens for messages that the kernel publishes."""
+    """IOPubChannel ABC.
+
+    The docstrings for this class can be found in the base implementation:
 
+    `IPython.zmq.kernelmanager.IOPubChannel`
+    """
 
     @abc.abstractmethod
     def flush(self, timeout=1.0):
-        """Immediately processes all pending messages on the SUB channel.
-
-        Callers should use this method to ensure that :method:`call_handlers`
-        has been called for all messages that have been received on the
-        0MQ SUB socket of this channel.
-
-        This method is thread safe.
-
-        Parameters
-        ----------
-        timeout : float, optional
-            The maximum amount of time to spend flushing, in seconds. The
-            default is one second.
-        """
         pass
 
 
 class StdInChannelABC(ChannelABC):
-    """A reply channel to handle raw_input requests that the kernel makes."""
+    """StdInChannel ABC.
+
+    The docstrings for this class can be found in the base implementation:
+
+    `IPython.zmq.kernelmanager.StdInChannel`
+    """
 
     @abc.abstractmethod
     def input(self, string):
-        """Send a string of raw input to the kernel."""
         pass
 
 
 class HBChannelABC(ChannelABC):
-    """The heartbeat channel which monitors the kernel heartbeat."""
+    """HBChannel ABC.
+
+    The docstrings for this class can be found in the base implementation:
+
+    `IPython.zmq.kernelmanager.HBChannel`
+    """
 
     @abc.abstractproperty
     def time_to_dead(self):
         pass
 
     @abc.abstractmethod
     def pause(self):
-        """Pause the heartbeat."""
         pass
 
     @abc.abstractmethod
     def unpause(self):
-        """Unpause the heartbeat."""
         pass
 
     @abc.abstractmethod
     def is_beating(self):
-        """Is the heartbeat running and responsive (and not paused)."""
         pass
 
 
 #-----------------------------------------------------------------------------
 # Main kernel manager class
 #-----------------------------------------------------------------------------
 
 class KernelManagerABC(object):
-    """ Manages a kernel for a frontend."""
+    """KernelManager ABC.
+
+    The docstrings for this class can be found in the base implementation:
+
+    `IPython.zmq.kernelmanager.KernelManager`
+    """
 
     __metaclass__ = abc.ABCMeta
 
     @abc.abstractproperty
     def kernel(self):
         pass
 
     @abc.abstractproperty
     def shell_channel_class(self):
         pass
 
     @abc.abstractproperty
     def iopub_channel_class(self):
         pass
 
     @abc.abstractproperty
     def hb_channel_class(self):
         pass
 
     @abc.abstractproperty
     def stdin_channel_class(self):
         pass
 
     #--------------------------------------------------------------------------
     # Channel management methods:
     #--------------------------------------------------------------------------
 
     @abc.abstractmethod
     def start_channels(self, shell=True, iopub=True, stdin=True, hb=True):
-        """Starts the channels for this kernel.
-
-        This will create the channels if they do not exist and then start
-        them. If port numbers of 0 are being used (random ports) then you
-        must first call :method:`start_kernel`. If the channels have been
-        stopped and you call this, :class:`RuntimeError` will be raised.
-        """
         pass
 
     @abc.abstractmethod
     def stop_channels(self):
-        """Stops all the running channels for this kernel."""
         pass
 
     @abc.abstractproperty
     def channels_running(self):
-        """Are any of the channels created and running?"""
         pass
 
     @abc.abstractproperty
     def shell_channel(self):
-        """Get the REQ socket channel object to make requests of the kernel."""
         pass
 
     @abc.abstractproperty
     def iopub_channel(self):
-        """Get the SUB socket channel object."""
         pass
 
     @abc.abstractproperty
     def stdin_channel(self):
-        """Get the REP socket channel object to handle stdin (raw_input)."""
         pass
 
     @abc.abstractproperty
     def hb_channel(self):
-        """Get the heartbeat socket channel object to check that the
-        kernel is alive."""
         pass
 
     #--------------------------------------------------------------------------
     # Kernel management.
     #--------------------------------------------------------------------------
 
     @abc.abstractmethod
     def start_kernel(self, **kw):
-        """Starts a kernel process and configures the manager to use it.
-
-        If random ports (port=0) are being used, this method must be called
-        before the channels are created.
-
-        Parameters:
-        -----------
-        launcher : callable, optional (default None)
-             A custom function for launching the kernel process (generally a
-             wrapper around ``entry_point.base_launch_kernel``). In most cases,
-             it should not be necessary to use this parameter.
-
-        **kw : optional
-             See respective options for IPython and Python kernels.
-        """
         pass
 
     @abc.abstractmethod
     def shutdown_kernel(self, now=False, restart=False):
-        """ Attempts to the stop the kernel process cleanly."""
         pass
 
     @abc.abstractmethod
     def restart_kernel(self, now=False, **kw):
-        """Restarts a kernel with the arguments that were used to launch it.
-
-        If the old kernel was launched with random ports, the same ports will be
-        used for the new kernel.
-
-        Parameters
-        ----------
-        now : bool, optional
-            If True, the kernel is forcefully restarted *immediately*, without
-            having a chance to do any cleanup action.  Otherwise the kernel is
-            given 1s to clean up before a forceful restart is issued.
-
-            In all cases the kernel is restarted, the only difference is whether
-            it is given a chance to perform a clean shutdown or not.
-
-        **kw : optional
-            Any options specified here will replace those used to launch the
-            kernel.
-        """
         pass
 
     @abc.abstractproperty
     def has_kernel(self):
-        """Returns whether a kernel process has been specified for the kernel
-        manager.
-        """
         pass
 
     @abc.abstractmethod
     def kill_kernel(self):
-        """ Kill the running kernel.
-
-        This method blocks until the kernel process has terminated.
-        """
         pass
 
     @abc.abstractmethod
     def interrupt_kernel(self):
-        """ Interrupts the kernel.
-
-        Unlike ``signal_kernel``, this operation is well supported on all
-        platforms.
-        """
         pass
 
     @abc.abstractmethod
     def signal_kernel(self, signum):
-        """ Sends a signal to the kernel.
-
-        Note that since only SIGTERM is supported on Windows, this function is
-        only useful on Unix systems.
-        """
         pass
 
     @abc.abstractproperty
     def is_alive(self):
-        """Is the kernel process still running?"""
         pass