python查看不到版本

1、版本localdomain 5.10.84-004.ali5000.alios7.x86_64 #1 SMP Thu Apr 7 21:37:58 CST 2022 x86_64 x86_64 x86_64 GNU/Linux

2、版本查看 [root@localhost ~]# python -V bash: python: command not found... Failed to search for file: cannot update repo 'appstream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]; Last error: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]

3、能看到安装的路劲，但是用不了 [root@localhost ~]# whereis python python: /usr/bin/python3.6 /usr/bin/python3.6m /usr/bin/python /usr/lib/python3.6 /usr/lib64/python3.6 /usr/include/python3.6m /usr/local/python-3.9.10/bin/python3.9 /usr/local/python-3.9.10/bin/python3.9-config /usr/share/man/man1/python.1.gz