CentOS7安装dnf后无法运行并报错:ImportError: No module named _conf
CentOS7通过epel的yum安装dnf后,运行dnf会报以下错误:Traceback(mostrecentcalllast):File"/usr/bin/dnf",line57,infromdnf.cliimportmainFile"/usr/lib/python2.7/site-packages/dnf/__init__.py",line30,inimportdnf.baseFile"/u