使用sudo权限
sudo -H [ ]
python命令 为符号软连接，可指向python2或3，默认2.7 。使用python3可以改软连接也可直接使用python3(也是软连接)
pip 与 pip3 对应python2和3
pip list 显示安装的包
pip -V 显示版本
更新pip
sudo -H pip install --upgrade pip
sudo -H pip3 install --upgrade pip“It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall “类似问题：
Cannot uninstall 'six'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
解决：
sudo pip3 install six --upgrade --ignore-installed six