pip 使用国内镜像源

pip config set global.index-url http://mirrors.aliyun.com/pypi/simple/
添加到信任名单中：pip config set global.trusted-host mirrors.aliyun.com，

注：如果此前已经设置过，可以直接打开 %APPDATA%\pip\pip.ini 这个文件进行修改，如果此前没有设置过，这个文件是不存在的，需要用命令设置：

 清华：

pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

pip config set global.trusted-host pypi.tuna.tsinghua.edu.cn

pip config list

 %APPDATA%\pip\pip.ini

[global]
index-url = http://pypi.mirrors.ustc.edu.cn/simple
trusted-host = pypi.mirrors.ustc.edu.cn

pip documentation
阿里云：
设置全局的下载地址：pip3 config set global.index-url http://mirrors.aliyun.com/pypi/simple/
添加到信任名单中：pip3 config set global.trusted-host mirrors.aliyun.com，要不然安装的时候会报错（
WARNING: The repository located at mirrors.aliyun.com is not a trusted or secure host and is being ignored. If this repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence this warning and allow it anyway with ‘–trusted-host mirrors.aliyun.com’.
ERROR: Could not find a version that satisfies the requirement opencv-python
ERROR: No matching distribution found for opencv-python）
修改完查看一下：pip3 config list

原文链接：https://blog.youkuaiyun.com/huzing2524/article/details/115704208

 原文链接：https://blog.youkuaiyun.com/qq_41375318/article/details/106895836