<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def change_password(self, previous_password, proposed_password):
 """ Change the User password """

        self.check_token()
        response = self.client.change_password(
            PreviousPassword=previous_password,
            ProposedPassword=proposed_password,
            AccessToken=self.access_token
        )
        self._set_attributes(response, {'password': proposed_password})