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

normalize unicode notebook filenames...

normalize unicode notebook filenames used in comparison check for notebook name change. Unless the filenames are normalized, unchanged names may result in false positives for a name change (e.g. OS X uses NFD on the filesystem, so u'\xfc' roundtripped to the filesystem will be u'u\u0308'), which can result in the first save of a notebook after open performing the following actions: 1. save the recently opened notebook 2. `old_name != new_name`, so name change detected 3. delete old_name (which is actually new_name), which ultimately deletes the just-saved notebook In master, this has a symptom of the first checkpoint failing because the first save actually deleted the file, and you can't checkpoint a notebook that doesn't exist. closes

Fernando Perez - - Load All Authors

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             importstring.py
        
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      # encoding: utf-8

      """

      A simple utility to import something by its string name.

      Authors:

      * Brian Granger

      """

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

      #  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.

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

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

      # 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]

          # 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

          if package:

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

              try:

                  pak = module.__dict__[obj]

              except KeyError:

                  raise ImportError('No module named %s' % obj)

              return pak

          else:

              return __import__(obj)

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				# encoding: utf-8
				"""
				A simple utility to import something by its string name.

				Authors:

				* Brian Granger
				"""

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

				#-----------------------------------------------------------------------------
				# 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]

				# 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

				if package:
				module = __import__(package,fromlist=[obj])
				try:
				pak = module.__dict__[obj]
				except KeyError:
				raise ImportError('No module named %s' % obj)
				return pak
				else:
				return __import__(obj)