support %matplotlib nbagg

we don't need to do anything, just add keys to a couple of dictionaries

IPython/core/pylabtools.py

@@ -1,367 +1,368 b''
 # -*- coding: utf-8 -*-
 """Pylab (matplotlib) support utilities."""
 from __future__ import print_function
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 from io import BytesIO
 
 from IPython.core.display import _pngxy
 from IPython.utils.decorators import flag_calls
 from IPython.utils import py3compat
 
 # If user specifies a GUI, that dictates the backend, otherwise we read the
 # user's mpl default from the mpl rc structure
 backends = {'tk': 'TkAgg',
             'gtk': 'GTKAgg',
             'gtk3': 'GTK3Agg',
             'wx': 'WXAgg',
             'qt': 'Qt4Agg', # qt3 not supported
             'qt4': 'Qt4Agg',
             'qt5': 'Qt5Agg',
             'osx': 'MacOSX',
+            'nbagg': 'nbAgg',
             'inline' : 'module://IPython.kernel.zmq.pylab.backend_inline'}
 
 # We also need a reverse backends2guis mapping that will properly choose which
 # GUI support to activate based on the desired matplotlib backend.  For the
 # most part it's just a reverse of the above dict, but we also need to add a
 # few others that map to the same GUI manually:
 backend2gui = dict(zip(backends.values(), backends.keys()))
 # Our tests expect backend2gui to just return 'qt'
 backend2gui['Qt4Agg'] = 'qt'
 # In the reverse mapping, there are a few extra valid matplotlib backends that
 # map to the same GUI support
 backend2gui['GTK'] = backend2gui['GTKCairo'] = 'gtk'
 backend2gui['GTK3Cairo'] = 'gtk3'
 backend2gui['WX'] = 'wx'
 backend2gui['CocoaAgg'] = 'osx'
 
 #-----------------------------------------------------------------------------
 # Matplotlib utilities
 #-----------------------------------------------------------------------------
 
 
 def getfigs(*fig_nums):
     """Get a list of matplotlib figures by figure numbers.
 
     If no arguments are given, all available figures are returned.  If the
     argument list contains references to invalid figures, a warning is printed
     but the function continues pasting further figures.
 
     Parameters
     ----------
     figs : tuple
         A tuple of ints giving the figure numbers of the figures to return.
     """
     from matplotlib._pylab_helpers import Gcf
     if not fig_nums:
         fig_managers = Gcf.get_all_fig_managers()
         return [fm.canvas.figure for fm in fig_managers]
     else:
         figs = []
         for num in fig_nums:
             f = Gcf.figs.get(num)
             if f is None:
                 print('Warning: figure %s not available.' % num)
             else:
                 figs.append(f.canvas.figure)
         return figs
 
 
 def figsize(sizex, sizey):
     """Set the default figure size to be [sizex, sizey].
 
     This is just an easy to remember, convenience wrapper that sets::
 
       matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
     """
     import matplotlib
     matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
 
 
 def print_figure(fig, fmt='png', bbox_inches='tight', **kwargs):
     """Print a figure to an image, and return the resulting file data
     
     Returned data will be bytes unless ``fmt='svg'``,
     in which case it will be unicode.
     
     Any keyword args are passed to fig.canvas.print_figure,
     such as ``quality`` or ``bbox_inches``.
     """
     from matplotlib import rcParams
     # When there's an empty figure, we shouldn't return anything, otherwise we
     # get big blank areas in the qt console.
     if not fig.axes and not fig.lines:
         return
 
     dpi = rcParams['savefig.dpi']
     if fmt == 'retina':
         dpi = dpi * 2
         fmt = 'png'
     
     # build keyword args
     kw = dict(
         format=fmt,
         facecolor=fig.get_facecolor(),
         edgecolor=fig.get_edgecolor(),
         dpi=dpi,
         bbox_inches=bbox_inches,
     )
     # **kwargs get higher priority
     kw.update(kwargs)
     
     bytes_io = BytesIO()
     fig.canvas.print_figure(bytes_io, **kw)
     data = bytes_io.getvalue()
     if fmt == 'svg':
         data = data.decode('utf-8')
     return data
     
 def retina_figure(fig, **kwargs):
     """format a figure as a pixel-doubled (retina) PNG"""
     pngdata = print_figure(fig, fmt='retina', **kwargs)
     w, h = _pngxy(pngdata)
     metadata = dict(width=w//2, height=h//2)
     return pngdata, metadata
 
 # We need a little factory function here to create the closure where
 # safe_execfile can live.
 def mpl_runner(safe_execfile):
     """Factory to return a matplotlib-enabled runner for %run.
 
     Parameters
     ----------
     safe_execfile : function
       This must be a function with the same interface as the
       :meth:`safe_execfile` method of IPython.
 
     Returns
     -------
     A function suitable for use as the ``runner`` argument of the %run magic
     function.
     """
     
     def mpl_execfile(fname,*where,**kw):
         """matplotlib-aware wrapper around safe_execfile.
 
         Its interface is identical to that of the :func:`execfile` builtin.
 
         This is ultimately a call to execfile(), but wrapped in safeties to
         properly handle interactive rendering."""
 
         import matplotlib
         import matplotlib.pylab as pylab
 
         #print '*** Matplotlib runner ***' # dbg
         # turn off rendering until end of script
         is_interactive = matplotlib.rcParams['interactive']
         matplotlib.interactive(False)
         safe_execfile(fname,*where,**kw)
         matplotlib.interactive(is_interactive)
         # make rendering call now, if the user tried to do it
         if pylab.draw_if_interactive.called:
             pylab.draw()
             pylab.draw_if_interactive.called = False
 
     return mpl_execfile
 
 
 def select_figure_formats(shell, formats, **kwargs):
     """Select figure formats for the inline backend.
 
     Parameters
     ==========
     shell : InteractiveShell
         The main IPython instance.
     formats : str or set
         One or a set of figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
     **kwargs : any
         Extra keyword arguments to be passed to fig.canvas.print_figure.
     """
     from matplotlib.figure import Figure
     from IPython.kernel.zmq.pylab import backend_inline
 
     svg_formatter = shell.display_formatter.formatters['image/svg+xml']
     png_formatter = shell.display_formatter.formatters['image/png']
     jpg_formatter = shell.display_formatter.formatters['image/jpeg']
     pdf_formatter = shell.display_formatter.formatters['application/pdf']
 
     if isinstance(formats, py3compat.string_types):
         formats = {formats}
     # cast in case of list / tuple
     formats = set(formats)
 
     [ f.pop(Figure, None) for f in shell.display_formatter.formatters.values() ]
     
     supported = {'png', 'png2x', 'retina', 'jpg', 'jpeg', 'svg', 'pdf'}
     bad = formats.difference(supported)
     if bad:
         bs = "%s" % ','.join([repr(f) for f in bad])
         gs = "%s" % ','.join([repr(f) for f in supported])
         raise ValueError("supported formats are: %s not %s" % (gs, bs))
     
     if 'png' in formats:
         png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
     if 'retina' in formats or 'png2x' in formats:
         png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))
     if 'jpg' in formats or 'jpeg' in formats:
         jpg_formatter.for_type(Figure, lambda fig: print_figure(fig, 'jpg', **kwargs))
     if 'svg' in formats:
         svg_formatter.for_type(Figure, lambda fig: print_figure(fig, 'svg', **kwargs))
     if 'pdf' in formats:
         pdf_formatter.for_type(Figure, lambda fig: print_figure(fig, 'pdf', **kwargs))
 
 #-----------------------------------------------------------------------------
 # Code for initializing matplotlib and importing pylab
 #-----------------------------------------------------------------------------
 
 
 def find_gui_and_backend(gui=None, gui_select=None):
     """Given a gui string return the gui and mpl backend.
 
     Parameters
     ----------
     gui : str
         Can be one of ('tk','gtk','wx','qt','qt4','inline').
     gui_select : str
         Can be one of ('tk','gtk','wx','qt','qt4','inline').
         This is any gui already selected by the shell.
 
     Returns
     -------
     A tuple of (gui, backend) where backend is one of ('TkAgg','GTKAgg',
     'WXAgg','Qt4Agg','module://IPython.kernel.zmq.pylab.backend_inline').
     """
 
     import matplotlib
 
     if gui and gui != 'auto':
         # select backend based on requested gui
         backend = backends[gui]
     else:
         # We need to read the backend from the original data structure, *not*
         # from mpl.rcParams, since a prior invocation of %matplotlib may have
         # overwritten that.
         # WARNING: this assumes matplotlib 1.1 or newer!!
         backend = matplotlib.rcParamsOrig['backend']
         # In this case, we need to find what the appropriate gui selection call
         # should be for IPython, so we can activate inputhook accordingly
         gui = backend2gui.get(backend, None)
 
         # If we have already had a gui active, we need it and inline are the
         # ones allowed.
         if gui_select and gui != gui_select:
             gui = gui_select
             backend = backends[gui]
 
     return gui, backend
 
 
 def activate_matplotlib(backend):
     """Activate the given backend and set interactive to True."""
 
     import matplotlib
     matplotlib.interactive(True)
     
     # Matplotlib had a bug where even switch_backend could not force
     # the rcParam to update. This needs to be set *before* the module
     # magic of switch_backend().
     matplotlib.rcParams['backend'] = backend
 
     import matplotlib.pyplot
     matplotlib.pyplot.switch_backend(backend)
 
     # This must be imported last in the matplotlib series, after
     # backend/interactivity choices have been made
     import matplotlib.pylab as pylab
 
     pylab.show._needmain = False
     # We need to detect at runtime whether show() is called by the user.
     # For this, we wrap it into a decorator which adds a 'called' flag.
     pylab.draw_if_interactive = flag_calls(pylab.draw_if_interactive)
 
 
 def import_pylab(user_ns, import_all=True):
     """Populate the namespace with pylab-related values.
     
     Imports matplotlib, pylab, numpy, and everything from pylab and numpy.
     
     Also imports a few names from IPython (figsize, display, getfigs)
     
     """
 
     # Import numpy as np/pyplot as plt are conventions we're trying to
     # somewhat standardize on.  Making them available to users by default
     # will greatly help this.
     s = ("import numpy\n"
           "import matplotlib\n"
           "from matplotlib import pylab, mlab, pyplot\n"
           "np = numpy\n"
           "plt = pyplot\n"
           )
     exec(s, user_ns)
     
     if import_all:
         s = ("from matplotlib.pylab import *\n"
              "from numpy import *\n")
         exec(s, user_ns)
     
     # IPython symbols to add
     user_ns['figsize'] = figsize
     from IPython.core.display import display
     # Add display and getfigs to the user's namespace
     user_ns['display'] = display
     user_ns['getfigs'] = getfigs
 
 
 def configure_inline_support(shell, backend):
     """Configure an IPython shell object for matplotlib use.
 
     Parameters
     ----------
     shell : InteractiveShell instance
 
     backend : matplotlib backend
     """
     # If using our svg payload backend, register the post-execution
     # function that will pick up the results for display.  This can only be
     # done with access to the real shell object.
 
     # Note: if we can't load the inline backend, then there's no point
     # continuing (such as in terminal-only shells in environments without
     # zeromq available).
     try:
         from IPython.kernel.zmq.pylab.backend_inline import InlineBackend
     except ImportError:
         return
     from matplotlib import pyplot
 
     cfg = InlineBackend.instance(parent=shell)
     cfg.shell = shell
     if cfg not in shell.configurables:
         shell.configurables.append(cfg)
 
     if backend == backends['inline']:
         from IPython.kernel.zmq.pylab.backend_inline import flush_figures
         shell.events.register('post_execute', flush_figures)
 
         # Save rcParams that will be overwrittern
         shell._saved_rcParams = dict()
         for k in cfg.rc:
             shell._saved_rcParams[k] = pyplot.rcParams[k]
         # load inline_rc
         pyplot.rcParams.update(cfg.rc)
     else:
         from IPython.kernel.zmq.pylab.backend_inline import flush_figures
         try:
             shell.events.unregister('post_execute', flush_figures)
         except ValueError:
             pass
         if hasattr(shell, '_saved_rcParams'):
             pyplot.rcParams.update(shell._saved_rcParams)
             del shell._saved_rcParams
 
     # Setup the default figure format
     select_figure_formats(shell, cfg.figure_formats, **cfg.print_figure_kwargs)
 

IPython/kernel/zmq/eventloops.py

@@ -1,276 +1,277 b''
 # encoding: utf-8
 """Event loop integration for the ZeroMQ-based kernels."""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 import os
 import sys
 
 import zmq
 
 from IPython.config.application import Application
 from IPython.utils import io
 
 
 def _on_os_x_10_9():
     import platform
     from distutils.version import LooseVersion as V
     return sys.platform == 'darwin' and V(platform.mac_ver()[0]) >= V('10.9')
 
 def _notify_stream_qt(kernel, stream):
     
     from IPython.external.qt_for_kernel import QtCore
     
     if _on_os_x_10_9() and kernel._darwin_app_nap:
         from IPython.external.appnope import nope_scope as context
     else:
         from IPython.core.interactiveshell import NoOpContext as context
 
     def process_stream_events():
         while stream.getsockopt(zmq.EVENTS) & zmq.POLLIN:
             with context():
                 kernel.do_one_iteration()
     
     fd = stream.getsockopt(zmq.FD)
     notifier = QtCore.QSocketNotifier(fd, QtCore.QSocketNotifier.Read, kernel.app)
     notifier.activated.connect(process_stream_events)
 
 # mapping of keys to loop functions
 loop_map = {
     'inline': None,
+    'nbagg': None,
     None : None,
 }
 
 def register_integration(*toolkitnames):
     """Decorator to register an event loop to integrate with the IPython kernel
     
     The decorator takes names to register the event loop as for the %gui magic.
     You can provide alternative names for the same toolkit.
     
     The decorated function should take a single argument, the IPython kernel
     instance, arrange for the event loop to call ``kernel.do_one_iteration()``
     at least every ``kernel._poll_interval`` seconds, and start the event loop.
     
     :mod:`IPython.kernel.zmq.eventloops` provides and registers such functions
     for a few common event loops.
     """
     def decorator(func):
         for name in toolkitnames:
             loop_map[name] = func
         return func
     
     return decorator
 
 
 @register_integration('qt', 'qt4')
 def loop_qt4(kernel):
     """Start a kernel with PyQt4 event loop integration."""
 
     from IPython.lib.guisupport import get_app_qt4, start_event_loop_qt4
 
     kernel.app = get_app_qt4([" "])
     kernel.app.setQuitOnLastWindowClosed(False)
     
     for s in kernel.shell_streams:
         _notify_stream_qt(kernel, s)
     
     start_event_loop_qt4(kernel.app)
 
 @register_integration('qt5')
 def loop_qt5(kernel):
     """Start a kernel with PyQt5 event loop integration."""
     os.environ['QT_API'] = 'pyqt5'
     return loop_qt4(kernel)
 
 
 @register_integration('wx')
 def loop_wx(kernel):
     """Start a kernel with wx event loop support."""
 
     import wx
     from IPython.lib.guisupport import start_event_loop_wx
     
     if _on_os_x_10_9() and kernel._darwin_app_nap:
         # we don't hook up App Nap contexts for Wx,
         # just disable it outright.
         from IPython.external.appnope import nope
         nope()
 
     doi = kernel.do_one_iteration
      # Wx uses milliseconds
     poll_interval = int(1000*kernel._poll_interval)
 
     # We have to put the wx.Timer in a wx.Frame for it to fire properly.
     # We make the Frame hidden when we create it in the main app below.
     class TimerFrame(wx.Frame):
         def __init__(self, func):
             wx.Frame.__init__(self, None, -1)
             self.timer = wx.Timer(self)
             # Units for the timer are in milliseconds
             self.timer.Start(poll_interval)
             self.Bind(wx.EVT_TIMER, self.on_timer)
             self.func = func
 
         def on_timer(self, event):
             self.func()
 
     # We need a custom wx.App to create our Frame subclass that has the
     # wx.Timer to drive the ZMQ event loop.
     class IPWxApp(wx.App):
         def OnInit(self):
             self.frame = TimerFrame(doi)
             self.frame.Show(False)
             return True
 
     # The redirect=False here makes sure that wx doesn't replace
     # sys.stdout/stderr with its own classes.
     kernel.app = IPWxApp(redirect=False)
 
     # The import of wx on Linux sets the handler for signal.SIGINT
     # to 0.  This is a bug in wx or gtk.  We fix by just setting it
     # back to the Python default.
     import signal
     if not callable(signal.getsignal(signal.SIGINT)):
         signal.signal(signal.SIGINT, signal.default_int_handler)
 
     start_event_loop_wx(kernel.app)
 
 
 @register_integration('tk')
 def loop_tk(kernel):
     """Start a kernel with the Tk event loop."""
 
     try:
         from tkinter import Tk  # Py 3
     except ImportError:
         from Tkinter import Tk  # Py 2
     doi = kernel.do_one_iteration
     # Tk uses milliseconds
     poll_interval = int(1000*kernel._poll_interval)
     # For Tkinter, we create a Tk object and call its withdraw method.
     class Timer(object):
         def __init__(self, func):
             self.app = Tk()
             self.app.withdraw()
             self.func = func
 
         def on_timer(self):
             self.func()
             self.app.after(poll_interval, self.on_timer)
 
         def start(self):
             self.on_timer()  # Call it once to get things going.
             self.app.mainloop()
 
     kernel.timer = Timer(doi)
     kernel.timer.start()
 
 
 @register_integration('gtk')
 def loop_gtk(kernel):
     """Start the kernel, coordinating with the GTK event loop"""
     from .gui.gtkembed import GTKEmbed
 
     gtk_kernel = GTKEmbed(kernel)
     gtk_kernel.start()
 
 
 @register_integration('gtk3')
 def loop_gtk3(kernel):
     """Start the kernel, coordinating with the GTK event loop"""
     from .gui.gtk3embed import GTKEmbed
 
     gtk_kernel = GTKEmbed(kernel)
     gtk_kernel.start()
 
 
 @register_integration('osx')
 def loop_cocoa(kernel):
     """Start the kernel, coordinating with the Cocoa CFRunLoop event loop
     via the matplotlib MacOSX backend.
     """
     import matplotlib
     if matplotlib.__version__ < '1.1.0':
         kernel.log.warn(
         "MacOSX backend in matplotlib %s doesn't have a Timer, "
         "falling back on Tk for CFRunLoop integration.  Note that "
         "even this won't work if Tk is linked against X11 instead of "
         "Cocoa (e.g. EPD).  To use the MacOSX backend in the kernel, "
         "you must use matplotlib >= 1.1.0, or a native libtk."
         )
         return loop_tk(kernel)
     
     from matplotlib.backends.backend_macosx import TimerMac, show
 
     # scale interval for sec->ms
     poll_interval = int(1000*kernel._poll_interval)
 
     real_excepthook = sys.excepthook
     def handle_int(etype, value, tb):
         """don't let KeyboardInterrupts look like crashes"""
         if etype is KeyboardInterrupt:
             io.raw_print("KeyboardInterrupt caught in CFRunLoop")
         else:
             real_excepthook(etype, value, tb)
 
     # add doi() as a Timer to the CFRunLoop
     def doi():
         # restore excepthook during IPython code
         sys.excepthook = real_excepthook
         kernel.do_one_iteration()
         # and back:
         sys.excepthook = handle_int
 
     t = TimerMac(poll_interval)
     t.add_callback(doi)
     t.start()
 
     # but still need a Poller for when there are no active windows,
     # during which time mainloop() returns immediately
     poller = zmq.Poller()
     if kernel.control_stream:
         poller.register(kernel.control_stream.socket, zmq.POLLIN)
     for stream in kernel.shell_streams:
         poller.register(stream.socket, zmq.POLLIN)
 
     while True:
         try:
             # double nested try/except, to properly catch KeyboardInterrupt
             # due to pyzmq Issue #130
             try:
                 # don't let interrupts during mainloop invoke crash_handler:
                 sys.excepthook = handle_int
                 show.mainloop()
                 sys.excepthook = real_excepthook
                 # use poller if mainloop returned (no windows)
                 # scale by extra factor of 10, since it's a real poll
                 poller.poll(10*poll_interval)
                 kernel.do_one_iteration()
             except:
                 raise
         except KeyboardInterrupt:
             # Ctrl-C shouldn't crash the kernel
             io.raw_print("KeyboardInterrupt caught in kernel")
         finally:
             # ensure excepthook is restored
             sys.excepthook = real_excepthook
 
 
 
 def enable_gui(gui, kernel=None):
     """Enable integration with a given GUI"""
     if gui not in loop_map:
         e = "Invalid GUI request %r, valid ones are:%s" % (gui, loop_map.keys())
         raise ValueError(e)
     if kernel is None:
         if Application.initialized():
             kernel = getattr(Application.instance(), 'kernel', None)
         if kernel is None:
             raise RuntimeError("You didn't specify a kernel,"
                 " and no IPython Application with a kernel appears to be running."
             )
     loop = loop_map[gui]
     if loop and kernel.eventloop is not None and kernel.eventloop is not loop:
         raise RuntimeError("Cannot activate multiple GUI eventloops")
     kernel.eventloop = loop