安装yum-3.4.3-154.el7.centos.noarch的时候提示上图。

解决方法: 将所依赖的python-urlgrabber和rpm包升级

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-25.el7.x86_64.rpm

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm

安装：

rpm -Uvh rpm-4.11.3-25.el7.x86_64.rpm --nodeps

rpm -Uvh python-urlgrabber-3.10-8.el7.noarch.rpm --nodeps

就可以解决