pip 源

pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple + package name

安装opencv

pip3 install opencv-python

报错

Traceback (most recent call last):
  File "/usr/bin/pip3", line 9, in <module>
    from pip import main
ImportError: cannot import name 'main'

执行

sudo python3 -m pip uninstall pip && sudo apt install python3-pip --reinstall