code: def get_user(self, id = None):
          
          if not id:
              id = self._user.id
  
          if id not in self._users:
              self._users[id] = self._user if id == self._user.id else User(self, id)
  
          return self._users[id]
docs: Get user.
  
          Returns:
              :class:`User`. User