运行登录知乎脚本报错

[hongze1999]

C:\Python27\python.exe F:/学习/python/常用库/request/zhihu_login.py
Traceback (most recent call last):
File "F:/ѧϰ/python/���ÿ�/request/zhihu_login.py", line 34, in
_xsrf = get_xsrf(session)
File "F:/ѧϰ/python/���ÿ�/request/zhihu_login.py", line 15, in get_xsrf
return _xsrf[0]
IndexError: list index out of range