code: def get_membership(self):
          
          user_id = self._user.me['user_id']
          for member in self.members:
              if member.user_id == user_id:
                  return member
          raise exceptions.MissingMembershipError(self.group_id, user_id)
docs: Get your membership.
  
          Note that your membership may not exist. For example, you do not have
          a membership in a former group. Also, the group returned by the API
          when rejoining a former group does not contain your membership. You
          must call :func:`refresh_from_server` to update the list of members.
  
          :return: your membership in the group
          :rtype: :class:`~groupy.api.memberships.Member`
          :raises groupy.exceptions.MissingMembershipError: if your membership is
                  not in the group data