是知乎的网页结构换了吗？出现大量的NONETYPE错误

[xxiong95]

title = soup.find("h2", class_="zm-item-title").string.encode("utf-8").replace("\n", "")
AttributeError: 'NoneType' object has no attribute 'string'

[Getitswan]

同问= =
python2 test.py
Traceback (most recent call last):
File "test.py", line 304, in
main()
File "test.py", line 288, in main
question_test(url)
File "test.py", line 35, in question_test
title = question.get_title()
File "C:\Users\swanxie\Desktop\zhihu-python-master\zhihu.py", line 291, in get_title
title = soup.find("h2", class_="zm-item-title").string.encode("utf-8").replace("\n", "")
AttributeError: 'NoneType' object has no attribute 'string