pip安装库报错：WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None))

python -m pip install pip==20.2 -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

这是由于pip的版本过高

参考链接：https://blog.csdn.net/qq_41684249/article/details/110505807