<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _original_attr(self, attr_name):
 """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 """

        try:
            return getattr(
                getattr(self.obj.__class__, attr_name), '_doubles_target_method', None
            )
        except AttributeError:
            return None