old_contents: from __future__ import absolute_import, print_function, unicode_literals
  
  import functools
  import collections
  
  def save_method_args(method):
      """
      Wrap a method such that when it is called, the args and kwargs are
      saved on the method.
  
      >>> class MyClass(object):
      ...     @save_method_args
      ...     def method(self, a, b):
      ...         print(a, b)
      >>> my_ob = MyClass()
      >>> my_ob.method(1, 2)
      1 2
      >>> my_ob._saved_method.args
      (1, 2)
      >>> my_ob._saved_method.kwargs
      {}
      >>> my_ob.method(a=3, b='foo')
      3 foo
      >>> my_ob._saved_method.args
      ()
      >>> my_ob._saved_method.kwargs == dict(a=3, b='foo')
      True
  
      The arguments are stored on the instance, allowing for
      different instance to save different args.
  
      >>> your_ob = MyClass()
      >>> your_ob.method({3}, b=[4])
      {3} [4]
      >>> your_ob._saved_method.args
      ({3},)
      >>> my_ob._saved_method.args
      ()
      """
      args_and_kwargs = collections.namedtuple('args_and_kwargs', 'args kwargs')
      @functools.wraps(method)
      def wrapper(self, *args, **kwargs):
          attr_name = '_saved_' + method.__name__
          attr = args_and_kwargs(args, kwargs)
          setattr(self, attr_name, attr)
          return method(self, *args, **kwargs)
      return wrapper
  
new_contents: from __future__ import absolute_import, print_function, unicode_literals
  
  import functools
  import collections
  
  def save_method_args(method):
      """
      Wrap a method such that when it is called, the args and kwargs are
      saved on the method.
  
      >>> class MyClass(object):
      ...     @save_method_args
      ...     def method(self, a, b):
      ...         print(a, b)
      >>> my_ob = MyClass()
      >>> my_ob.method(1, 2)
      1 2
      >>> my_ob._saved_method.args
      (1, 2)
      >>> my_ob._saved_method.kwargs
      {}
      >>> my_ob.method(a=3, b='foo')
      3 foo
      >>> my_ob._saved_method.args
      ()
      >>> my_ob._saved_method.kwargs == dict(a=3, b='foo')
      True
  
      The arguments are stored on the instance, allowing for
      different instance to save different args.
  
      >>> your_ob = MyClass()
      >>> your_ob.method({'x': 3}, b=[4])
      {'x': 3} [4]
      >>> your_ob._saved_method.args
      ({'x': 3},)
      >>> my_ob._saved_method.args
      ()
      """
      args_and_kwargs = collections.namedtuple('args_and_kwargs', 'args kwargs')
      @functools.wraps(method)
      def wrapper(self, *args, **kwargs):
          attr_name = '_saved_' + method.__name__
          attr = args_and_kwargs(args, kwargs)
          setattr(self, attr_name, attr)
          return method(self, *args, **kwargs)
      return wrapper
  
subject: Fix failing test for Python 2