腾讯云服务器重装python3.
系统：TencentOS Server
重置本机ECDSA host key：ssh-keygen -R "IP address"
查看python3
# whereis python3 python3: /usr/bin/python3.8 /usr/bin/python3.6 /usr/bin/python3 /usr/bin/python3.6m /usr/lib/python3.8 /usr/lib/python3.6 /usr/lib64/python3.8 /usr/lib64/python3.6 /usr/local/lib/python3.6 /usr/include/python3.8 /usr/include/python3.6m /usr/share/man/man1/python3.1.gz
查看/usr/bin/yum文件并备份
# cat /usr/bin/yum #!/usr/libexec/platform-python # The dnf executable script.
卸载python3
rpm -qa|grep python3|xargs rpm -ev --allmatches --nodeps whereis python3 |xargs rm -frv whereis python
这个方法会清掉 /usr/bin/yum, 由于yum里引用了python包里的dnf，所以，比较蛋疼，最后导致yum 和dnf 不能用了。