code: def _original_attr(self, attr_name):
          
          try:
              return getattr(
                  getattr(self.obj.__class__, attr_name), '_doubles_target_method', None
              )
          except AttributeError:
              return None
docs: Return the original attribute off of the proxy on the target object.
  
          :param str attr_name: the name of the original attribute to return
          :return: Func or None.
          :rtype: func