1、删除现有Python
# rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps ##强制删除已安装程序及其关联
# whereis python |xargs rm -frv -rf ##删除所有残余文件 ##xargs，允许你对输出执行其他某些命令
# whereis python ##验证删除，返回无结果
2、删除现有的yum
# rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps
# whereis yum |xargs rm -frv -rf
3、从http://mirrors.163.com/centos/7/os/x86_64/Packages/下相应的包
python-2.7.5-68.el7.x86_64.rpm
python-devel-2.7.5-68.el7.x86_64.rpm
python-iniparse-0.4-9.el7.noarch.rpm
python-libs-2.7.5-68.el7.x86_64.rpm
python-pycurl-7.19.0-19.el7.x86_64.rpm
python-setuptools-0.9.8-7.el7.noarch.rpm
python-urlgrabber-3.10-8.el7.noarch.rpm
rpm-python-4.11.3-32.el7.x86_64.rpm
yum-3.4.3-158.el7.centos.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-plugin-aliases-1.1.31-45.el7.noarch.rpm
yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm
yum-plugin-protectbase-1.1.31-45.el7.noarch.rpm
yum-utils-1.1.31-45.el7.noarch.rpm
由于源中版本会更新，下载时具体请查看版本再下载下来！
4、修改文件名：
# mv python-setuptools-0.9.8-7.el7.noarch.rpm python-setuptools-0.9.8-7.el7.noarch
# mv yum-utils-1.1.31-45.el7.noarch.rpm yum-utils-1.1.31-45.el7.noarch
# mv yum-plugin-aliases-1.1.31-45.el7.noarch.rpm yum-plugin-aliases-1.1.31-45.el7.noarch
5、进行安装
# rpm -Uvh --replacepkgs python*.rpm
# rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm
问题测试
# python
Python 2.7.5 (default, Apr 11 2018, 07:36:10)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import yum
>>>
如上，要是什么都没报，则问题解决