直接执行这两个命令即可:
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 100
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150
如果要切换到Python2,执行:
sudo update-alternatives --config python
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参考:
原文:https://blog.csdn.net/wangguchao/article/details/81776177