root@localhost \~\]# dnf --version
Traceback (most recent call last):
File "/usr/bin/dnf", line 57, in \
from dnf.cli import main
File "/usr/lib/python2.7/site-packages/dnf/__init__.py", line 30, in \
import dnf.base
File "/usr/lib/python2.7/site-packages/dnf/base.py", line 29, in \
import libdnf.transaction
File "/usr/lib64/python2.7/site-packages/libdnf/__init__.py", line 3, in \
from . import conf
File "/usr/lib64/python2.7/site-packages/libdnf/conf.py", line 17, in \
_conf = swig_import_helper()
File "/usr/lib64/python2.7/site-packages/libdnf/conf.py", line 16, in swig_import_helper
return importlib.import_module('_conf')
File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
ImportError: No module named _conf
解决方法：
因为服务器环境为CentOS 7，没有完全预装在 CentOS 7 中，所以需要先全安装DNF。
# yum install epel-release
# yum install dnf
# dnf --version
二、解决办法
1、先升级python:
#yum update python\*
2、再安装以下软件：
```bash
yum -y install dnf-data dnf-plugins-core libdnf-devel libdnf python2-dnf-plugin-migrate dnf-automatic
```
3、测试
\[root@localhost \~\]# dnf --version
4.0.9
Installed: dnf-0:4.0.9.2-2.el7_9.noarch at Tue 09 Apr 2024 06:06:01 PM CST
Built : CentOS BuildSystem \ at Wed 07 Apr 2021 03:52:38 PM CST
Installed: rpm-0:4.11.3-48.el7_9.x86_64 at Tue 09 Apr 2024 06:13:58 PM CST
Built : CentOS BuildSystem \ at Wed 24 Nov 2021 04:33:39 PM CST