1、更新Pip
python -m pip install --upgrade pip
2、永久换源（阿里）
pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/
3、临时换源（阿里）
pip install markdown -i https://mirrors.aliyun.com/pypi/simple/4、验证源是否生效
pip config list
5、恢复默认源
删除配置文件或运行：
pip config unset global.index-url
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