upstream/ipython Files · IPython/utils/importstring.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.

Fernando Perez - - Load All Authors

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             importstring.py
        
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        Brian Granger
    
A number of changes to how traitlets and components work....

              r2229
            
      # encoding: utf-8

      """

      A simple utility to import something by its string name.

      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.

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

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

      # Functions and classes

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

      def import_item(name):

          """Import and return bar given the string foo.bar."""

          package = '.'.join(name.split('.')[0:-1])

          obj = name.split('.')[-1]

        Fernando Perez
    
Add explicit comment about disabled code in importstring....

              r3121
            
          # Note: the original code for this was the following.  We've left it

          # visible for now in case the new implementation shows any problems down

          # the road, to make it easier on anyone looking for a problem.  This code

          # should be removed once we're comfortable we didn't break anything.

          ## execString = 'from %s import %s' % (package, obj)

          ## try:

          ##     exec execString

          ## except SyntaxError:

          ##     raise ImportError("Invalid class specification: %s" % name)

          ## exec 'temp = %s' % obj

          ## return temp

        Thomas Kluyver
    
Cleaning up old code to simplify 2to3 conversion.

              r3108
            
          if package:

              module = __import__(package,fromlist=[obj])

              return module.__dict__[obj]

          else:

              return __import__(obj)

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Brian Granger A number of changes to how traitlets and components work....	r2229	# encoding: utf-8
		"""
		A simple utility to import something by its string name.

		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.
		#-----------------------------------------------------------------------------

		#-----------------------------------------------------------------------------
		# Functions and classes
		#-----------------------------------------------------------------------------

		def import_item(name):
		"""Import and return bar given the string foo.bar."""
		package = '.'.join(name.split('.')[0:-1])
		obj = name.split('.')[-1]
Fernando Perez Add explicit comment about disabled code in importstring....	r3121
		# Note: the original code for this was the following. We've left it
		# visible for now in case the new implementation shows any problems down
		# the road, to make it easier on anyone looking for a problem. This code
		# should be removed once we're comfortable we didn't break anything.

		## execString = 'from %s import %s' % (package, obj)
		## try:
		## exec execString
		## except SyntaxError:
		## raise ImportError("Invalid class specification: %s" % name)
		## exec 'temp = %s' % obj
		## return temp

Thomas Kluyver Cleaning up old code to simplify 2to3 conversion.	r3108	if package:
		module = __import__(package,fromlist=[obj])
		return module.__dict__[obj]
		else:
		return __import__(obj)