更换pip安装源头成阿里云或清华的

在Windows%appdata%/pip/pip.ini(无则新增对应文件夹及文件)

[global]
timeout = 6000
#index-url = https://pypi.tuna.tsinghua.edu.cn/simple
#trusted-host = pypi.tuna.tsinghua.edu.cn
index-url = http://mirrors.aliyun.com/pypi/simple/
trusted-host = mirrors.aliyun.com

效果切换后可以执行pip install tensorflow==2.4.1了，不在提示连接国外网站时候提示ssl配置问题了

原文链接：https://blog.csdn.net/studyvcmfc/article/details/116572099

https://blog.csdn.net/zhao_5352269/article/details/94432483

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