Ubuntu 18.04安装python2.7和python3.6共存

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安装python2.7

sudo apt install python2.7

安装pip和pip3

sudo apt install python-pip
sudo apt install python3-pip

查看python版本和pip版本

python -V
pip -V

查看python路径和pip路径

whereis python
whereis pip

设置清华源

mkdir .pip && cd .pip && touch pip.conf && gedit pip.conf

pip.conf

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple

升级pip到对新版本

python -m pip install --upgrade pip