old_contents: from __future__ import print_function
  from __future__ import division
  import sys
  import types
  from ast import PyCF_ONLY_AST
  
  PY2 = sys.version_info[0] == 2
  PYPY = hasattr(sys, 'pypy_translation_info')
  
  _identity = lambda x: x
  
  if not PY2:
      string_types = (str,)
      integer_types = (int,)
      long = int
      class_types = (type,)
  
      from io import StringIO
      import builtins
  
      def to_bytes(s):
          return s.encode()
  
      def to_str(b):
          return b.decode()
  else:
      string_types = (str, unicode)
      integer_types = (int, long)
      long = long
      class_types = (type, types.ClassType)
  
      from cStringIO import StringIO
      import __builtin__ as builtins
  
      to_bytes = _identity
      to_str = _identity
  
  def ast_parse(s):
      return compile(s, '<string>', 'exec', \
                     print_function.compiler_flag|division.compiler_flag|PyCF_ONLY_AST)
  
new_contents: import sys
  import types
  from ast import PyCF_ONLY_AST
  
  PY2 = sys.version_info[0] == 2
  PYPY = hasattr(sys, 'pypy_translation_info')
  
  _identity = lambda x: x
  
  if not PY2:
      string_types = (str,)
      integer_types = (int,)
      long = int
      class_types = (type,)
  
      from io import StringIO
      import builtins
  
      def to_bytes(s):
          return s.encode()
  
      def to_str(b):
          return b.decode()
  else:
      string_types = (str, unicode)
      integer_types = (int, long)
      long = long
      class_types = (type, types.ClassType)
  
      from cStringIO import StringIO
      import __builtin__ as builtins
  
      to_bytes = _identity
      to_str = _identity
  
  def ast_parse(s):
      return compile(s, '<string>', 'exec', PyCF_ONLY_AST)
  
subject: Remove the __future__ flags