':param Answer answer: ç­æ¡å¯¹è±¡
:param string content: è¯è®ºåå®¹
:return: æåè¿å TrueïŒå€±èŽ¥è¿å False
:rtype: bool'

def add_comment(self, answer, content):

    from .answer import Answer
    if (isinstance(answer, Answer) is False):
        raise ValueError('argument    answer    need    to    be    Zhihu.Answer    object.')
    if (not content):
        raise ValueError('answer    content    cannot    be    empty')
    data = {'method': 'add_comment', 'params': json.dumps({'answer_id': answer.aid, 'content': content}), '_xsrf': answer.xsrf}
    res = self._session.post(Answer_Add_Comment_URL, data=data)
    return (res.json()['r'] == 0)
