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

        attrs = {k: self.__dict__[k].copy() for k in self.containers}
        attrs.update({k: cp.deepcopy(self.__dict__[k]) for k in self.shared})
        return self.__class__(**attrs)