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所需安装包（下载地址）：
#所需依赖
python-libs-2.7.5-58.el7.x86_64.rpm
python-2.7.5-58.el7.x86_64.rpm
python-iniparse-0.4-9.el7.noarch.rpm
python-pycurl-7.19.0-19.el7.x86_64.rpm
rpm-python-4.11.3-25.el7.x86_64.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
#安装要用
yum-3.4.3-154.el7.centos.noarch.rpm
yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm安装命令：
rpm -ivh python-libs-2.7.5-58.el7.x86_64.rpm
rpm -ivh python-2.7.5-58.el7.x86_64.rpm
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm
rpm -ivh python-pycurl-7.19.0-19.el7.x86_64.rpm
rpm -ivh rpm-python-4.11.3-25.el7.x86_64.rpm
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-3.4.3-154.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm此时yum命令已经可用，但是安装软件会报错，继续执行以下程序
修改yum源：
cd /etc/yum.repos.d下载所需软件包（下载地址）；
将下载的软件包放到/etc/yum.repos.d/下面
运行makecache 生成缓存
yum makecache 运行yum clean all
yum clean all更新yum文件
yum update