解决：
from flask.ext.httpauth import HTTPBasicAuth
改为
from flask_httpauth import HTTPBasicAuth
提示ModuleNotFoundError: No module named ‘flask_httpauth‘
pip install flask_httpauth
然后即可运行。
flask报错No module named 'flask.ext'
原文：https://www.cnblogs.com/sea-stream/p/10273944.html