def list_boards(self, board_filter="all"):
        json_obj = self.fetch_json('/members/me/boards/?filter=%s' % board_filter)
        return [Board.from_json(self, json_obj=obj) for obj in json_obj]
When raising an exception, use "raise ValueError('message')"
dataset/ETHPy150Open sarumont/py-trello/trello/trelloclient.py/TrelloClient.list_boards--crossover with--dataset/ETHPy150Open kivy/plyer/plyer/tools/pep8checker/pep8.py/python_3000_raise_comma