code: def user_lists(self, username, member_type="USER"):
          
          return self.client.service.getUserLists(username, member_type, self.proxy_id)
docs: Look up all the lists that the user is a member of.
  
          Args:
              username (str): The MIT username of the user
              member_type(str): The type of user, "USER" or "STRING"
  
          Returns:
              list of strings: names of the lists that this user is a member of