分析：
網上給出的方法都是修改/usr/bin/yum文件的頭部，把/usr/bin/python修改為/usr/bin/python2.x就可以了，但我的情況是我把舊的python已經卸載了，於是嘗試重新安裝2.7版本的python
python版本下載地址：https://www.python.org/ftp/python/
下載2.7.5
wget https://www.python.org/ftp/python/2.7.5/Python-2.7.5.tar.xz
解壓縮
tar -xvf Python-2.7.5.tar.xz
創建路徑安裝路徑
mkdir /usr/local/python
切換到安裝路徑執行
./configure --prefix=/usr/local/python/
make
make install
創建軟連接
ln -s /usr/local/python/bin/python /usr/bin/python
安裝完成以后依舊報原有的錯誤，和上圖一樣；這有點煩銀了，繼續找辦法。。。
發現有博客講下載python以及yum的rpm包，行不行先試一試，
創建腳本下載相關的rpm包
mkdir /opt/packages/python
vim pull.sh
#!/bin/bash
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/lvm2-python-libs-2.02.177-4.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-libs-2.7.5-68.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-ipaddress-1.0.16-2.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-2.7.5-68.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-chardet-2.2.1-1.el7_1.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/rpm-python-4.11.3-32.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-utils-1.1.31-45.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-3.4.3-158.el7.centos.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-plugin-aliases-1.1.31-45.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-45.el7.noarch.rpm
wget http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm
#安裝
rpm -Uvh --replacepkgs lvm2-python-libs*.rpm --nodeps --force
rpm -Uvh --replacepkgs libxml2-python*.rpm --nodeps --force
rpm -Uvh --replacepkgs python*.rpm --nodeps --force
rpm -Uvh --replacepkgs yum*.rpm --nodeps --force
檢測安裝的python和yum
不試不知道，一試真見效 ！
參考鏈接：
https://www.cnblogs.com/sueyyyy/p/10410832.html
https://www.linuxidc.com/Linux/2017-08/146518.htm
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原文鏈接：https://blog.csdn.net/weixin_42315182/article/details/103769872