old_contents: # Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
  # Copyright (c) 2013 Julien Danjou <julien@danjou.info>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the "Software"),
  # to deal in the Software without restriction, including without limitation
  # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  # and/or sell copies of the Software, and to permit persons to whom the
  # Software is furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  # DEALINGS IN THE SOFTWARE.
  
  import contextlib
  import sys
  
  
  if sys.version_info[0] >= 3:
      str_type = str
  else:
      str_type = unicode
  
  
  @contextlib.contextmanager
  def temporary_attribute_value(obj, attribute, value):
      """Temporarily switch an object attribute value to another value."""
      original_value = getattr(obj, attribute)
      setattr(obj, attribute, value)
  
      try:
          yield
      except Exception:
          pass
  
      setattr(obj, attribute, original_value)
  
  
  def flatten_literal_list(entry):
      for e in entry:
          if type(e) == list:
              for x in flatten_literal_list(e):
                  yield x  # needs more yield-from
          else:
              yield e
  
new_contents: # Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
  # Copyright (c) 2013 Julien Danjou <julien@danjou.info>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the "Software"),
  # to deal in the Software without restriction, including without limitation
  # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  # and/or sell copies of the Software, and to permit persons to whom the
  # Software is furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  # DEALINGS IN THE SOFTWARE.
  
  import contextlib
  import sys
  
  
  if sys.version_info[0] >= 3:
      str_type = str
  else:
      str_type = unicode
  
  
  @contextlib.contextmanager
  def temporary_attribute_value(obj, attribute, value):
      """Temporarily switch an object attribute value to another value."""
      original_value = getattr(obj, attribute)
      setattr(obj, attribute, value)
      yield
      setattr(obj, attribute, original_value)
  
  
  def flatten_literal_list(entry):
      for e in entry:
          if type(e) == list:
              for x in flatten_literal_list(e):
                  yield x  # needs more yield-from
          else:
              yield e
  
subject: Revert wrong changes on temporary_attribute_value