卸载py3

Linux（Ubuntu）环境下安装卸载Python3（避免踩坑）_ubuntu卸载python-CSDN博客https://blog.csdn.net/BLee_0123/article/details/136075374

安装py2.7

Ubuntu上重装Python2（强烈建议在不删除数据情况下，直接重装系统，不要动原本的Python，用anaconda做环境隔离）_ubuntu安装python2-CSDN博客https://blog.csdn.net/special00/article/details/134923569#:~:text=%E4%B8%80%E3%80%81%E5%9C%A8Ubuntu%E4%B8%8A%E5%8D%B8%E8%BD%BD%20Python2%201%201%E3%80%81%E6%A3%80%E6%9F%A5Python2%E7%9A%84%E7%89%88%E6%9C%AC%20%E5%9C%A8%E5%BC%80%E5%A7%8B%E5%8D%B8%E8%BD%BDPython2%E4%B9%8B%E5%89%8D%EF%BC%8C%E6%88%91%E4%BB%AC%E9%9C%80%E8%A6%81%E5%85%88%E6%A3%80%E6%9F%A5Python2%E7%9A%84%E7%89%88%E6%9C%AC%E3%80%82%20%E6%96%B0%E7%9A%84Ubuntu%E7%89%88%E6%9C%AC%E9%80%9A%E5%B8%B8%E9%83%BD%E9%A2%84%E8%A3%85%E4%BA%86Python3%EF%BC%8C%E8%80%8CPython2%E6%98%AF%E4%BD%9C%E4%B8%BA%E9%99%84%E5%B1%9E%E5%8C%85%20%28package%29%E4%B8%80%E8%B5%B7%E5%AE%89%E8%A3%85%E7%9A%84%E3%80%82%20...,4%E3%80%81%E6%B8%85%E7%90%86%E6%AE%8B%E7%95%99%E6%96%87%E4%BB%B6%20%E5%8D%B8%E8%BD%BDPython2%E4%B9%8B%E5%90%8E%EF%BC%8C%E5%8F%AF%E8%83%BD%E8%BF%98%E4%BC%9A%E7%95%99%E4%B8%8B%E4%B8%80%E4%BA%9B%E6%AE%8B%E7%95%99%E6%96%87%E4%BB%B6%E3%80%82%20%E5%9C%A8%E7%BB%88%E7%AB%AF%E4%B8%AD%E8%BE%93%E5%85%A5%E4%BB%A5%E4%B8%8B%E5%91%BD%E4%BB%A4%EF%BC%8C%E4%BB%A5%E6%B8%85%E7%90%86%E6%AE%8B%E7%95%99%E6%96%87%E4%BB%B6%EF%BC%9A%20...%205%205%E3%80%81%E4%BF%AE%E6%94%B9%E9%BB%98%E8%AE%A4Python%E7%89%88%E6%9C%AC%20%E5%A6%82%E6%9E%9C%E4%BD%A0%E9%9C%80%E8%A6%81%E5%B0%86Python3%E8%AE%BE%E7%BD%AE%E4%B8%BA%E9%BB%98%E8%AE%A4%E7%89%88%E6%9C%AC%EF%BC%8C%E5%88%99%E5%8F%AF%E4%BB%A5%E5%9C%A8%E7%BB%88%E7%AB%AF%E4%B8%AD%E8%BE%93%E5%85%A5%E4%BB%A5%E4%B8%8B%E5%91%BD%E4%BB%A4%E6%9D%A5%E8%BF%9B%E8%A1%8C%E4%BF%AE%E6%94%B9%EF%BC%9A%20