def post(self, param, h, r):
try:<EOL><INDENT>rsp = self.client().post(self.uri(), param)<EOL>return self.result(rsp, h, r)<EOL><DEDENT>except ValueError as err:<EOL><INDENT>return h.catch_exception(err, r)<EOL><DEDENT>
Args:
    param: request parameters
    h: ResultHandler
    r: YunpianApiResult