upstream/ipython Files · IPython/utils/syspathcontext.py

Prevent qtconsole frontend freeze on lots of output....

Prevent qtconsole frontend freeze on lots of output. The output from the kernel is now clipped to last `buffer_size` before displaying and a timer is used to flush the pending output text instead of attempting to display text on every stream output from kernel. The timer interval is adjusted based on actual time taken to append a screenful of text to widget. This throttles the widget repaints and avoids choking the Qt event loop leaving time to handle other Qt events. Test cases: In [1]: for i in xrange(1000000): print i In [2]: range(100000) Without this commit the first input causes the qtconsole frontend to freeze, not responding to `Ctrl+C`.

Matthias BUSSONNIER - - Load All Authors

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             syspathcontext.py
        
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        Brian Granger
    
Work on startup related things....

              r2252
            
      # encoding: utf-8

      """

      Context managers for adding things to sys.path temporarily.

      Authors:

      * Brian Granger

      """

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

        Matthias BUSSONNIER
    
update copyright to 2011/20xx-2011...

              r5390
            
      #  Copyright (C) 2008-2011  The IPython Development Team

        Brian Granger
    
Work on startup related things....

              r2252
            
      #

      #  Distributed under the terms of the BSD License.  The full license is in

      #  the file COPYING, distributed as part of this software.

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

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

      # Imports

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

      import sys

        Brian Granger
    
Work to address the review comments on Fernando's branch....

              r2498
            
      #-----------------------------------------------------------------------------

      # Code

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

        Brian Granger
    
Work on startup related things....

              r2252
            
      class appended_to_syspath(object):

          """A context for appending a directory to sys.path for a second."""

          def __init__(self, dir):

              self.dir = dir

          def __enter__(self):

              if self.dir not in sys.path:

                  sys.path.append(self.dir)

                  self.added = True

              else:

                  self.added = False

          def __exit__(self, type, value, traceback):

              if self.added:

                  try:

                      sys.path.remove(self.dir)

                  except ValueError:

                      pass

              # Returning False causes any exceptions to be re-raised.

              return False

      class prepended_to_syspath(object):

          """A context for prepending a directory to sys.path for a second."""

          def __init__(self, dir):

              self.dir = dir

          def __enter__(self):

              if self.dir not in sys.path:

                  sys.path.insert(0,self.dir)

                  self.added = True

              else:

                  self.added = False

          def __exit__(self, type, value, traceback):

              if self.added:

                  try:

                      sys.path.remove(self.dir)

                  except ValueError:

                      pass

              # Returning False causes any exceptions to be re-raised.

              return False

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Brian Granger Work on startup related things....	r2252	# encoding: utf-8
		"""
		Context managers for adding things to sys.path temporarily.

		Authors:

		* Brian Granger
		"""

		#-----------------------------------------------------------------------------
Matthias BUSSONNIER update copyright to 2011/20xx-2011...	r5390	# Copyright (C) 2008-2011 The IPython Development Team
Brian Granger Work on startup related things....	r2252	#
		# Distributed under the terms of the BSD License. The full license is in
		# the file COPYING, distributed as part of this software.
		#-----------------------------------------------------------------------------

		#-----------------------------------------------------------------------------
		# Imports
		#-----------------------------------------------------------------------------

		import sys

Brian Granger Work to address the review comments on Fernando's branch....	r2498	#-----------------------------------------------------------------------------
		# Code
		#-----------------------------------------------------------------------------

Brian Granger Work on startup related things....	r2252	class appended_to_syspath(object):
		"""A context for appending a directory to sys.path for a second."""

		def __init__(self, dir):
		self.dir = dir

		def __enter__(self):
		if self.dir not in sys.path:
		sys.path.append(self.dir)
		self.added = True
		else:
		self.added = False

		def __exit__(self, type, value, traceback):
		if self.added:
		try:
		sys.path.remove(self.dir)
		except ValueError:
		pass
		# Returning False causes any exceptions to be re-raised.
		return False

		class prepended_to_syspath(object):
		"""A context for prepending a directory to sys.path for a second."""

		def __init__(self, dir):
		self.dir = dir

		def __enter__(self):
		if self.dir not in sys.path:
		sys.path.insert(0,self.dir)
		self.added = True
		else:
		self.added = False

		def __exit__(self, type, value, traceback):
		if self.added:
		try:
		sys.path.remove(self.dir)
		except ValueError:
		pass
		# Returning False causes any exceptions to be re-raised.
		return False