下载慢时使用以下方法替换镜像源:
1``.vim ~/.pip/pip.conf
[global]
index-url = https:``//pypi.tuna.tsinghua.edu.cn/simple/
trusted-host = pypi.tuna.tsinghua.edu.cn
2``.sudo sed -i ``"s@http://.*archive.ubuntu.com@http://mirrors.aliyun.com@g" /etc/apt/sources.list
sudo sed -i ``"s@http://.*security.ubuntu.com@http://mirrors.aliyun.com@g" /etc/apt/sources.list