https://www.cnblogs.com/suwanbin-thought/articles/11741019.html
https://blog.csdn.net/xiaojing0511/article/details/95179896
python -m pip install --upgrade pip -i https://pypi.douban.com/simple
https://www.cnblogs.com/suwanbin-thought/articles/11741019.html
https://blog.csdn.net/xiaojing0511/article/details/95179896
python -m pip install --upgrade pip -i https://pypi.douban.com/simple