def get(self, chat_id):
res = self._get('<STR_LIT>', params={'<STR_LIT>': chat_id})<EOL>return res['<STR_LIT>']<EOL>
获取群聊会话

详情请参考
https://work.weixin.qq.com/api/doc#90000/90135/90247

:param chat_id: 群聊id
:return: 会话信息