define InlineBackend configurable in its own file

avoids unnecessary matplotlib imports

IPython/kernel/zmq/pylab/config.py

@@ -0,0 +1,85 b''
+"""Configurable for configuring the IPython inline backend
+
+This module does not import anything from matplotlib.
+"""
+#-----------------------------------------------------------------------------
+#       Copyright (C) 2011 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
+#-----------------------------------------------------------------------------
+
+from IPython.config.configurable import SingletonConfigurable
+from IPython.utils.traitlets import Dict, Instance, CaselessStrEnum, Bool
+from IPython.utils.warn import warn
+
+#-----------------------------------------------------------------------------
+# Configurable for inline backend options
+#-----------------------------------------------------------------------------
+
+# inherit from InlineBackendConfig for deprecation purposes
+class InlineBackendConfig(SingletonConfigurable):
+    pass
+
+class InlineBackend(InlineBackendConfig):
+    """An object to store configuration of the inline backend."""
+
+    def _config_changed(self, name, old, new):
+        # warn on change of renamed config section
+        if new.InlineBackendConfig != old.InlineBackendConfig:
+            warn("InlineBackendConfig has been renamed to InlineBackend")
+        super(InlineBackend, self)._config_changed(name, old, new)
+
+    # The typical default figure size is too large for inline use,
+    # so we shrink the figure size to 6x4, and tweak fonts to
+    # make that fit.
+    rc = Dict({'figure.figsize': (6.0,4.0),
+        # play nicely with white background in the Qt and notebook frontend
+        'figure.facecolor': 'white',
+        'figure.edgecolor': 'white',
+        # 12pt labels get cutoff on 6x4 logplots, so use 10pt.
+        'font.size': 10,
+        # 72 dpi matches SVG/qtconsole
+        # this only affects PNG export, as SVG has no dpi setting
+        'savefig.dpi': 72,
+        # 10pt still needs a little more room on the xlabel:
+        'figure.subplot.bottom' : .125
+        }, config=True,
+        help="""Subset of matplotlib rcParams that should be different for the
+        inline backend."""
+    )
+
+    figure_format = CaselessStrEnum(['svg', 'png', 'retina'], default_value='png', config=True,
+        help="The image format for figures with the inline backend.")
+
+    def _figure_format_changed(self, name, old, new):
+        from IPython.core.pylabtools import select_figure_format
+        if self.shell is None:
+            return
+        else:
+            select_figure_format(self.shell, new)
+    
+    close_figures = Bool(True, config=True,
+        help="""Close all figures at the end of each cell.
+        
+        When True, ensures that each cell starts with no active figures, but it
+        also means that one must keep track of references in order to edit or
+        redraw figures in subsequent cells. This mode is ideal for the notebook,
+        where residual plots from other cells might be surprising.
+        
+        When False, one must call figure() to create new figures. This means
+        that gcf() and getfigs() can reference figures created in other cells,
+        and the active figure can continue to be edited with pylab/pyplot
+        methods that reference the current active figure. This mode facilitates
+        iterative editing of figures, and behaves most consistently with
+        other matplotlib backends, but figure barriers between cells must
+        be explicit.
+        """)
+
+    shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
+
+

IPython/consoleapp.py

@@ -1,393 +1,387 b''
 """ A minimal application base mixin for all ZMQ based IPython frontends.
 
 This is not a complete console app, as subprocess will not be able to receive
 input, there is no real readline support, among other limitations. This is a
 refactoring of what used to be the IPython/qt/console/qtconsoleapp.py
 
 Authors:
 
 * Evan Patterson
 * Min RK
 * Erik Tollerud
 * Fernando Perez
 * Bussonnier Matthias
 * Thomas Kluyver
 * Paul Ivanov
 
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # stdlib imports
 import atexit
 import json
 import os
 import signal
 import sys
 import uuid
 
 
 # Local imports
 from IPython.config.application import boolean_flag
 from IPython.core.profiledir import ProfileDir
 from IPython.kernel.blocking import BlockingKernelClient
 from IPython.kernel import KernelManager
 from IPython.kernel import tunnel_to_kernel, find_connection_file, swallow_argv
 from IPython.utils.path import filefind
 from IPython.utils.py3compat import str_to_bytes
 from IPython.utils.traitlets import (
     Dict, List, Unicode, CUnicode, Int, CBool, Any
 )
 from IPython.kernel.zmq.kernelapp import (
     kernel_flags,
     kernel_aliases,
     IPKernelApp
 )
+from IPython.kernel.zmq.pylab.config import InlineBackend
 from IPython.kernel.zmq.session import Session, default_secure
 from IPython.kernel.zmq.zmqshell import ZMQInteractiveShell
 from IPython.kernel.connect import ConnectionFileMixin
 
 #-----------------------------------------------------------------------------
 # Network Constants
 #-----------------------------------------------------------------------------
 
 from IPython.utils.localinterfaces import localhost
 
 #-----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
 
 
 #-----------------------------------------------------------------------------
 # Aliases and Flags
 #-----------------------------------------------------------------------------
 
 flags = dict(kernel_flags)
 
 # the flags that are specific to the frontend
 # these must be scrubbed before being passed to the kernel,
 # or it will raise an error on unrecognized flags
 app_flags = {
     'existing' : ({'IPythonConsoleApp' : {'existing' : 'kernel*.json'}},
             "Connect to an existing kernel. If no argument specified, guess most recent"),
 }
 app_flags.update(boolean_flag(
     'confirm-exit', 'IPythonConsoleApp.confirm_exit',
     """Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
        to force a direct exit without any confirmation.
     """,
     """Don't prompt the user when exiting. This will terminate the kernel
        if it is owned by the frontend, and leave it alive if it is external.
     """
 ))
 flags.update(app_flags)
 
 aliases = dict(kernel_aliases)
 
 # also scrub aliases from the frontend
 app_aliases = dict(
     ip = 'IPythonConsoleApp.ip',
     transport = 'IPythonConsoleApp.transport',
     hb = 'IPythonConsoleApp.hb_port',
     shell = 'IPythonConsoleApp.shell_port',
     iopub = 'IPythonConsoleApp.iopub_port',
     stdin = 'IPythonConsoleApp.stdin_port',
     existing = 'IPythonConsoleApp.existing',
     f = 'IPythonConsoleApp.connection_file',
 
 
     ssh = 'IPythonConsoleApp.sshserver',
 )
 aliases.update(app_aliases)
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # IPythonConsole
 #-----------------------------------------------------------------------------
 
-classes = [IPKernelApp, ZMQInteractiveShell, KernelManager, ProfileDir, Session]
-
-try:
-    from IPython.kernel.zmq.pylab.backend_inline import InlineBackend
-except ImportError:
-    pass
-else:
-    classes.append(InlineBackend)
+classes = [IPKernelApp, ZMQInteractiveShell, KernelManager, ProfileDir, Session, InlineBackend]
 
 class IPythonConsoleApp(ConnectionFileMixin):
     name = 'ipython-console-mixin'
 
     description = """
         The IPython Mixin Console.
         
         This class contains the common portions of console client (QtConsole,
         ZMQ-based terminal console, etc).  It is not a full console, in that
         launched terminal subprocesses will not be able to accept input.
         
         The Console using this mixing supports various extra features beyond
         the single-process Terminal IPython shell, such as connecting to
         existing kernel, via:
         
             ipython <appname> --existing
         
         as well as tunnel via SSH
         
     """
 
     classes = classes
     flags = Dict(flags)
     aliases = Dict(aliases)
     kernel_manager_class = KernelManager
     kernel_client_class = BlockingKernelClient
 
     kernel_argv = List(Unicode)
     # frontend flags&aliases to be stripped when building kernel_argv
     frontend_flags = Any(app_flags)
     frontend_aliases = Any(app_aliases)
 
     # create requested profiles by default, if they don't exist:
     auto_create = CBool(True)
     # connection info:
     
     sshserver = Unicode('', config=True,
         help="""The SSH server to use to connect to the kernel.""")
     sshkey = Unicode('', config=True,
         help="""Path to the ssh key to use for logging in to the ssh server.""")
     
     hb_port = Int(0, config=True,
         help="set the heartbeat port [default: random]")
     shell_port = Int(0, config=True,
         help="set the shell (ROUTER) port [default: random]")
     iopub_port = Int(0, config=True,
         help="set the iopub (PUB) port [default: random]")
     stdin_port = Int(0, config=True,
         help="set the stdin (DEALER) port [default: random]")
     connection_file = Unicode('', config=True,
         help="""JSON file in which to store connection info [default: kernel-<pid>.json]
 
         This file will contain the IP, ports, and authentication key needed to connect
         clients to this kernel. By default, this file will be created in the security-dir
         of the current profile, but can be specified by absolute path.
         """)
     def _connection_file_default(self):
         return 'kernel-%i.json' % os.getpid()
 
     existing = CUnicode('', config=True,
         help="""Connect to an already running kernel""")
 
     confirm_exit = CBool(True, config=True,
         help="""
         Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
         to force a direct exit without any confirmation.""",
     )
 
 
     def build_kernel_argv(self, argv=None):
         """build argv to be passed to kernel subprocess"""
         if argv is None:
             argv = sys.argv[1:]
         self.kernel_argv = swallow_argv(argv, self.frontend_aliases, self.frontend_flags)
         # kernel should inherit default config file from frontend
         self.kernel_argv.append("--IPKernelApp.parent_appname='%s'" % self.name)
     
     def init_connection_file(self):
         """find the connection file, and load the info if found.
         
         The current working directory and the current profile's security
         directory will be searched for the file if it is not given by
         absolute path.
         
         When attempting to connect to an existing kernel and the `--existing`
         argument does not match an existing file, it will be interpreted as a
         fileglob, and the matching file in the current profile's security dir
         with the latest access time will be used.
         
         After this method is called, self.connection_file contains the *full path*
         to the connection file, never just its name.
         """
         if self.existing:
             try:
                 cf = find_connection_file(self.existing)
             except Exception:
                 self.log.critical("Could not find existing kernel connection file %s", self.existing)
                 self.exit(1)
             self.log.info("Connecting to existing kernel: %s" % cf)
             self.connection_file = cf
         else:
             # not existing, check if we are going to write the file
             # and ensure that self.connection_file is a full path, not just the shortname
             try:
                 cf = find_connection_file(self.connection_file)
             except Exception:
                 # file might not exist
                 if self.connection_file == os.path.basename(self.connection_file):
                     # just shortname, put it in security dir
                     cf = os.path.join(self.profile_dir.security_dir, self.connection_file)
                 else:
                     cf = self.connection_file
                 self.connection_file = cf
         
         # should load_connection_file only be used for existing?
         # as it is now, this allows reusing ports if an existing
         # file is requested
         try:
             self.load_connection_file()
         except Exception:
             self.log.error("Failed to load connection file: %r", self.connection_file, exc_info=True)
             self.exit(1)
     
     def load_connection_file(self):
         """load ip/port/hmac config from JSON connection file"""
         # this is identical to IPKernelApp.load_connection_file
         # perhaps it can be centralized somewhere?
         try:
             fname = filefind(self.connection_file, ['.', self.profile_dir.security_dir])
         except IOError:
             self.log.debug("Connection File not found: %s", self.connection_file)
             return
         self.log.debug(u"Loading connection file %s", fname)
         with open(fname) as f:
             cfg = json.load(f)
         self.transport = cfg.get('transport', 'tcp')
         self.ip = cfg.get('ip', localhost())
         
         for channel in ('hb', 'shell', 'iopub', 'stdin', 'control'):
             name = channel + '_port'
             if getattr(self, name) == 0 and name in cfg:
                 # not overridden by config or cl_args
                 setattr(self, name, cfg[name])
         if 'key' in cfg:
             self.config.Session.key = str_to_bytes(cfg['key'])
         if 'signature_scheme' in cfg:
             self.config.Session.signature_scheme = cfg['signature_scheme']
     
     def init_ssh(self):
         """set up ssh tunnels, if needed."""
         if not self.existing or (not self.sshserver and not self.sshkey):
             return
         self.load_connection_file()
         
         transport = self.transport
         ip = self.ip
         
         if transport != 'tcp':
             self.log.error("Can only use ssh tunnels with TCP sockets, not %s", transport)
             sys.exit(-1)
         
         if self.sshkey and not self.sshserver:
             # specifying just the key implies that we are connecting directly
             self.sshserver = ip
             ip = localhost()
         
         # build connection dict for tunnels:
         info = dict(ip=ip,
                     shell_port=self.shell_port,
                     iopub_port=self.iopub_port,
                     stdin_port=self.stdin_port,
                     hb_port=self.hb_port
         )
         
         self.log.info("Forwarding connections to %s via %s"%(ip, self.sshserver))
         
         # tunnels return a new set of ports, which will be on localhost:
         self.ip = localhost()
         try:
             newports = tunnel_to_kernel(info, self.sshserver, self.sshkey)
         except:
             # even catch KeyboardInterrupt
             self.log.error("Could not setup tunnels", exc_info=True)
             self.exit(1)
         
         self.shell_port, self.iopub_port, self.stdin_port, self.hb_port = newports
         
         cf = self.connection_file
         base,ext = os.path.splitext(cf)
         base = os.path.basename(base)
         self.connection_file = os.path.basename(base)+'-ssh'+ext
         self.log.critical("To connect another client via this tunnel, use:")
         self.log.critical("--existing %s" % self.connection_file)
     
     def _new_connection_file(self):
         cf = ''
         while not cf:
             # we don't need a 128b id to distinguish kernels, use more readable
             # 48b node segment (12 hex chars).  Users running more than 32k simultaneous
             # kernels can subclass.
             ident = str(uuid.uuid4()).split('-')[-1]
             cf = os.path.join(self.profile_dir.security_dir, 'kernel-%s.json' % ident)
             # only keep if it's actually new.  Protect against unlikely collision
             # in 48b random search space
             cf = cf if not os.path.exists(cf) else ''
         return cf
 
     def init_kernel_manager(self):
         # Don't let Qt or ZMQ swallow KeyboardInterupts.
         if self.existing:
             self.kernel_manager = None
             return
         signal.signal(signal.SIGINT, signal.SIG_DFL)
 
         # Create a KernelManager and start a kernel.
         self.kernel_manager = self.kernel_manager_class(
                                 ip=self.ip,
                                 transport=self.transport,
                                 shell_port=self.shell_port,
                                 iopub_port=self.iopub_port,
                                 stdin_port=self.stdin_port,
                                 hb_port=self.hb_port,
                                 connection_file=self.connection_file,
                                 parent=self,
         )
         self.kernel_manager.client_factory = self.kernel_client_class
         self.kernel_manager.start_kernel(extra_arguments=self.kernel_argv)
         atexit.register(self.kernel_manager.cleanup_ipc_files)
 
         if self.sshserver:
             # ssh, write new connection file
             self.kernel_manager.write_connection_file()
 
         # in case KM defaults / ssh writing changes things:
         km = self.kernel_manager
         self.shell_port=km.shell_port
         self.iopub_port=km.iopub_port
         self.stdin_port=km.stdin_port
         self.hb_port=km.hb_port
         self.connection_file = km.connection_file
 
         atexit.register(self.kernel_manager.cleanup_connection_file)
 
     def init_kernel_client(self):
         if self.kernel_manager is not None:
             self.kernel_client = self.kernel_manager.client()
         else:
             self.kernel_client = self.kernel_client_class(
                                 ip=self.ip,
                                 transport=self.transport,
                                 shell_port=self.shell_port,
                                 iopub_port=self.iopub_port,
                                 stdin_port=self.stdin_port,
                                 hb_port=self.hb_port,
                                 connection_file=self.connection_file,
                                 parent=self,
             )
 
         self.kernel_client.start_channels()
 
 
 
     def initialize(self, argv=None):
         """
         Classes which mix this class in should call:
                IPythonConsoleApp.initialize(self,argv)
         """
         self.init_connection_file()
         default_secure(self.config)
         self.init_ssh()
         self.init_kernel_manager()
         self.init_kernel_client()
 

IPython/kernel/zmq/pylab/backend_inline.py

@@ -1,214 +1,153 b''
-"""Produce SVG versions of active plots for display by the rich Qt frontend.
-"""
+"""A matplotlib backend for publishing figures via display_data"""
+#-----------------------------------------------------------------------------
+#       Copyright (C) 2011 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
 #-----------------------------------------------------------------------------
 from __future__ import print_function
 
 # Third-party imports
 import matplotlib
-from matplotlib.backends.backend_agg import new_figure_manager, FigureCanvasAgg
+from matplotlib.backends.backend_agg import FigureCanvasAgg
 from matplotlib._pylab_helpers import Gcf
 
-# Local imports.
-from IPython.config.configurable import SingletonConfigurable
+# Local imports
+from IPython.core.getipython import get_ipython
 from IPython.core.display import display
-from IPython.core.displaypub import publish_display_data
-from IPython.core.pylabtools import print_figure, select_figure_format
-from IPython.utils.traitlets import Dict, Instance, CaselessStrEnum, Bool
-from IPython.utils.warn import warn
-
-#-----------------------------------------------------------------------------
-# Configurable for inline backend options
-#-----------------------------------------------------------------------------
-# inherit from InlineBackendConfig for deprecation purposes
-class InlineBackendConfig(SingletonConfigurable):
-    pass
-
-class InlineBackend(InlineBackendConfig):
-    """An object to store configuration of the inline backend."""
-
-    def _config_changed(self, name, old, new):
-        # warn on change of renamed config section
-        if new.InlineBackendConfig != old.InlineBackendConfig:
-            warn("InlineBackendConfig has been renamed to InlineBackend")
-        super(InlineBackend, self)._config_changed(name, old, new)
-
-    # The typical default figure size is too large for inline use,
-    # so we shrink the figure size to 6x4, and tweak fonts to
-    # make that fit.
-    rc = Dict({'figure.figsize': (6.0,4.0),
-        # play nicely with white background in the Qt and notebook frontend
-        'figure.facecolor': 'white',
-        'figure.edgecolor': 'white',
-        # 12pt labels get cutoff on 6x4 logplots, so use 10pt.
-        'font.size': 10,
-        # 72 dpi matches SVG/qtconsole
-        # this only affects PNG export, as SVG has no dpi setting
-        'savefig.dpi': 72,
-        # 10pt still needs a little more room on the xlabel:
-        'figure.subplot.bottom' : .125
-        }, config=True,
-        help="""Subset of matplotlib rcParams that should be different for the
-        inline backend."""
-    )
-
-    figure_format = CaselessStrEnum(['svg', 'png', 'retina'], default_value='png', config=True,
-        help="The image format for figures with the inline backend.")
-
-    def _figure_format_changed(self, name, old, new):
-        if self.shell is None:
-            return
-        else:
-            select_figure_format(self.shell, new)
-    
-    close_figures = Bool(True, config=True,
-        help="""Close all figures at the end of each cell.
-        
-        When True, ensures that each cell starts with no active figures, but it
-        also means that one must keep track of references in order to edit or
-        redraw figures in subsequent cells. This mode is ideal for the notebook,
-        where residual plots from other cells might be surprising.
-        
-        When False, one must call figure() to create new figures. This means
-        that gcf() and getfigs() can reference figures created in other cells,
-        and the active figure can continue to be edited with pylab/pyplot
-        methods that reference the current active figure. This mode facilitates
-        iterative editing of figures, and behaves most consistently with
-        other matplotlib backends, but figure barriers between cells must
-        be explicit.
-        """)
-
-    shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
 
+from .config import InlineBackend
 
 #-----------------------------------------------------------------------------
 # Functions
 #-----------------------------------------------------------------------------
 
 def show(close=None):
     """Show all figures as SVG/PNG payloads sent to the IPython clients.
 
     Parameters
     ----------
     close : bool, optional
       If true, a ``plt.close('all')`` call is automatically issued after
       sending all the figures. If this is set, the figures will entirely
       removed from the internal list of figures.
     """
     if close is None:
         close = InlineBackend.instance().close_figures
     try:
         for figure_manager in Gcf.get_all_fig_managers():
             display(figure_manager.canvas.figure)
     finally:
         show._to_draw = []
         if close:
             matplotlib.pyplot.close('all')
 
 
-
 # This flag will be reset by draw_if_interactive when called
 show._draw_called = False
 # list of figures to draw when flush_figures is called
 show._to_draw = []
 
 
 def draw_if_interactive():
     """
     Is called after every pylab drawing command
     """
     # signal that the current active figure should be sent at the end of
     # execution.  Also sets the _draw_called flag, signaling that there will be
     # something to send.  At the end of the code execution, a separate call to
     # flush_figures() will act upon these values
     manager = Gcf.get_active()
     if manager is None:
         return
     fig = manager.canvas.figure
 
     # Hack: matplotlib FigureManager objects in interacive backends (at least
     # in some of them) monkeypatch the figure object and add a .show() method
     # to it.  This applies the same monkeypatch in order to support user code
     # that might expect `.show()` to be part of the official API of figure
     # objects.
     # For further reference:
     # https://github.com/ipython/ipython/issues/1612
     # https://github.com/matplotlib/matplotlib/issues/835
     
     if not hasattr(fig, 'show'):
         # Queue up `fig` for display
         fig.show = lambda *a: display(fig)
 
     # If matplotlib was manually set to non-interactive mode, this function
     # should be a no-op (otherwise we'll generate duplicate plots, since a user
     # who set ioff() manually expects to make separate draw/show calls).
     if not matplotlib.is_interactive():
         return
 
     # ensure current figure will be drawn, and each subsequent call
     # of draw_if_interactive() moves the active figure to ensure it is
     # drawn last
     try:
         show._to_draw.remove(fig)
     except ValueError:
         # ensure it only appears in the draw list once
         pass
     # Queue up the figure for drawing in next show() call
     show._to_draw.append(fig)
     show._draw_called = True
 
 
 def flush_figures():
     """Send all figures that changed
 
     This is meant to be called automatically and will call show() if, during
     prior code execution, there had been any calls to draw_if_interactive.
     
     This function is meant to be used as a post_execute callback in IPython,
     so user-caused errors are handled with showtraceback() instead of being
     allowed to raise.  If this function is not called from within IPython,
     then these exceptions will raise.
     """
     if not show._draw_called:
         return
     
     if InlineBackend.instance().close_figures:
         # ignore the tracking, just draw and close all figures
         try:
             return show(True)
         except Exception as e:
             # safely show traceback if in IPython, else raise
             try:
                 get_ipython
             except NameError:
                 raise e
             else:
                 get_ipython().showtraceback()
                 return
     try:
         # exclude any figures that were closed:
         active = set([fm.canvas.figure for fm in Gcf.get_all_fig_managers()])
         for fig in [ fig for fig in show._to_draw if fig in active ]:
             try:
                 display(fig)
             except Exception as e:
                 # safely show traceback if in IPython, else raise
                 try:
                     get_ipython
                 except NameError:
                     raise e
                 else:
                     get_ipython().showtraceback()
                     break
     finally:
         # clear flags for next round
         show._to_draw = []
         show._draw_called = False
 
 
 # Changes to matplotlib in version 1.2 requires a mpl backend to supply a default
 # figurecanvas. This is set here to a Agg canvas
 # See https://github.com/matplotlib/matplotlib/pull/1125
 FigureCanvas = FigureCanvasAgg