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

inputhook: disable CTRL+C when a hook is active....

inputhook: disable CTRL+C when a hook is active. On systems with 'readline', it's very likely to intercept a signal during a select() call. The default SIGINT handler will schedule a KeyboardInterrupt exception to be raised as soon as possible. If ctypes is used to install a Python callback for PyOS_InputHook, this will happen as soon as the bytecode execution starts, so even if the first instruction of the callback is a `try: ... except KeyboardInterrupt` clause, it's actually too late. As ctypes doesn't allow a Python callback to raise an exception, this ends up with IPython detecting an internal error... not pretty. We must therefore ignore the SIGINT signals until we are sure the exception handler is active, in the Python callback.

Thomas Spura - - 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

      """

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

      #  Copyright (C) 2008-2009  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

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

      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
		"""

		#-----------------------------------------------------------------------------
		# Copyright (C) 2008-2009 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
		#-----------------------------------------------------------------------------

		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