upstream/ipython Files · IPython/frontend/qt/kernelmanager.py

Merge pull request from takluyver/import-performance...

Merge pull request from takluyver/import-performance Import performance Defer various imports for a small reduction in startup time. IPython.lib.__init__ previously loaded IPython.lib.inputhook to export some of its functions. This meant that importing anything from IPython.lib also loaded inputhook. For now, I've just removed that import, but that is an API change, because the functions are no longer accessible as e.g. IPython.lib.enable_qt4 Added a note about the API change. Timing command, borrowed from Openoffice to simulate cold start: $ sync ; echo 3 | sudo tee /proc/sys/vm/drop_caches; time ipython3 -c pass Results with this branch: 7.68, 7.64, 7.35, 7.38 s 'real' Results with master: 8.17, 8.04, 7.81, 7.77

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             kernelmanager.py
        
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      """ Defines a KernelManager that provides signals and slots.

      """

      # Local imports.

      from IPython.utils.traitlets import Type

      from IPython.kernel.kernelmanager import ShellChannel, IOPubChannel, \

          StdInChannel, HBChannel, KernelManager

      from base_kernelmanager import QtShellChannelMixin, QtIOPubChannelMixin, \

          QtStdInChannelMixin, QtHBChannelMixin, QtKernelManagerMixin

      class QtShellChannel(QtShellChannelMixin, ShellChannel):

          pass

      class QtIOPubChannel(QtIOPubChannelMixin, IOPubChannel):

          pass

      class QtStdInChannel(QtStdInChannelMixin, StdInChannel):

          pass

      class QtHBChannel(QtHBChannelMixin, HBChannel):

          pass

      class QtKernelManager(QtKernelManagerMixin, KernelManager):

          """ A KernelManager that provides signals and slots.

          """

          iopub_channel_class = Type(QtIOPubChannel)

          shell_channel_class = Type(QtShellChannel)

          stdin_channel_class = Type(QtStdInChannel)

          hb_channel_class = Type(QtHBChannel)

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				""" Defines a KernelManager that provides signals and slots.
				"""

				# Local imports.
				from IPython.utils.traitlets import Type
				from IPython.kernel.kernelmanager import ShellChannel, IOPubChannel, \
				StdInChannel, HBChannel, KernelManager
				from base_kernelmanager import QtShellChannelMixin, QtIOPubChannelMixin, \
				QtStdInChannelMixin, QtHBChannelMixin, QtKernelManagerMixin


				class QtShellChannel(QtShellChannelMixin, ShellChannel):
				pass

				class QtIOPubChannel(QtIOPubChannelMixin, IOPubChannel):
				pass

				class QtStdInChannel(QtStdInChannelMixin, StdInChannel):
				pass

				class QtHBChannel(QtHBChannelMixin, HBChannel):
				pass


				class QtKernelManager(QtKernelManagerMixin, KernelManager):
				""" A KernelManager that provides signals and slots.
				"""

				iopub_channel_class = Type(QtIOPubChannel)
				shell_channel_class = Type(QtShellChannel)
				stdin_channel_class = Type(QtStdInChannel)
				hb_channel_class = Type(QtHBChannel)