CentOS7通过epel的yum安装dnf后，运行dnf会报以下错误：
Traceback (most recent call last):
File "/usr/bin/dnf", line 57, in <module>
from dnf.cli import main
File "/usr/lib/python2.7/site-packages/dnf/__init__.py", line 30, in <module>
import dnf.base
File "/usr/lib/python2.7/site-packages/dnf/base.py", line 29, in <module>
import libdnf.transaction
File "/usr/lib64/python2.7/site-packages/libdnf/__init__.py", line 3, in <module>
from . import conf
File "/usr/lib64/python2.7/site-packages/libdnf/conf.py", line 17, in <module>
_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
其实最主要的错误就是最后一条：ImportError: No module named _conf
github上找到解决办法：
先升级python:
yum update python*
再安装以下软件：
yum install dnf-data dnf-plugins-core libdnf-devel libdnf python2-dnf-plugin-migrate dnf-automatic
再次运行dnf，就正常了。
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转载，原文链接：https://blog.csdn.net/brucemiao/java/article/details/107250962