upstream/ipython Files · IPython/core/ipapi.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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      # encoding: utf-8

      """

      This module is *completely* deprecated and should no longer be used for

      any purpose.  Currently, we have a few parts of the core that have

      not been componentized and thus, still rely on this module.  When everything

      has been made into a component, this module will be sent to deathrow.

      """

      #-----------------------------------------------------------------------------

      #  Copyright (C) 2008-2011  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

      #-----------------------------------------------------------------------------

      #-----------------------------------------------------------------------------

      # Classes and functions

      #-----------------------------------------------------------------------------

      def get():

          """Get the global InteractiveShell instance."""

          from IPython.core.interactiveshell import InteractiveShell

          return InteractiveShell.instance()

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				# encoding: utf-8
				"""
				This module is completely deprecated and should no longer be used for
				any purpose. Currently, we have a few parts of the core that have
				not been componentized and thus, still rely on this module. When everything
				has been made into a component, this module will be sent to deathrow.
				"""

				#-----------------------------------------------------------------------------
				# Copyright (C) 2008-2011 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
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Classes and functions
				#-----------------------------------------------------------------------------


				def get():
				"""Get the global InteractiveShell instance."""
				from IPython.core.interactiveshell import InteractiveShell
				return InteractiveShell.instance()