python安装依赖库镜像源
python依赖库安装国内镜像源列表：
清华pip镜像源
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple requests
阿里云pip镜像源
pip install -i http://mirrors.aliyun.com/pypi/simple requests
豆瓣pip镜像源
pip install -i http://pypi.douban.com/simple/ requests
清华pip镜像源
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple requests
阿里云pip镜像源
pip install -i http://mirrors.aliyun.com/pypi/simple requests
豆瓣pip镜像源
pip install -i http://pypi.douban.com/simple/ requests
