old_contents: # Copyright 2014 Google Inc. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  """A clone of the default copy.deepcopy that doesn't handle cyclic
  structures or complex types except for dicts and lists. This is
  because gyp copies so large structure that small copy overhead ends up
  taking seconds in a project the size of Chromium."""
  
  class Error(Exception):
    pass
  
  __all__ = ["Error", "deepcopy"]
  
  def deepcopy(x):
    """Deep copy operation on gyp objects such as strings, ints, dicts
    and lists. More than twice as fast as copy.deepcopy but much less
    generic."""
  
    try:
      return _deepcopy_dispatch[type(x)](x)
    except KeyError:
      raise Error('Unsupported type %s for deepcopy. Use copy.deepcopy ' +
                  'or expand simple_copy support.' % type(x))
  
  _deepcopy_dispatch = d = {}
  
  def _deepcopy_atomic(x):
    return x
  
  for x in (type(None), int, long, float,
            bool, str, unicode, type):
    d[x] = _deepcopy_atomic
  
  def _deepcopy_list(x):
    return [deepcopy(a) for a in x]
  d[list] = _deepcopy_list
  
  def _deepcopy_dict(x):
    y = {}
    for key, value in x.iteritems():
      y[deepcopy(key)] = deepcopy(value)
    return y
  d[dict] = _deepcopy_dict
  
  del d
  
new_contents: # Copyright 2014 Google Inc. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  """A clone of the default copy.deepcopy that doesn't handle cyclic
  structures or complex types except for dicts and lists. This is
  because gyp copies so large structure that small copy overhead ends up
  taking seconds in a project the size of Chromium."""
  
  class Error(Exception):
    pass
  
  __all__ = ["Error", "deepcopy"]
  
  def deepcopy(x):
    """Deep copy operation on gyp objects such as strings, ints, dicts
    and lists. More than twice as fast as copy.deepcopy but much less
    generic."""
  
    try:
      return _deepcopy_dispatch[type(x)](x)
    except KeyError:
      raise Error('Unsupported type %s for deepcopy. Use copy.deepcopy ' +
                  'or expand simple_copy support.' % type(x))
  
  _deepcopy_dispatch = d = {}
  
  def _deepcopy_atomic(x):
    return x
  
  try:
    _string_types = (str, unicode)
  # There's no unicode in python3
  except NameError:
    _string_types = (str, )
  
  try:
    _integer_types = (int, long)
  # There's no long in python3
  except NameError:
    _integer_types = (int, )
  
  for x in (type(None), float, bool, type) + _integer_types + _string_types:
    d[x] = _deepcopy_atomic
  
  def _deepcopy_list(x):
    return [deepcopy(a) for a in x]
  d[list] = _deepcopy_list
  
  def _deepcopy_dict(x):
    y = {}
    for key, value in x.iteritems():
      y[deepcopy(key)] = deepcopy(value)
    return y
  d[dict] = _deepcopy_dict
  
  del d
  
subject: Update simple_copy.py for Python3 types.