安裝python2.7需要與centos核心版本保持一致，否則會出現衝突

1、檢視centos核心版本

[[email protected]]# cat /etc/redhat-release cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)

2、解除安裝

解除安裝python:

#rpm -qa|grep python|xargs rpm -e --allmatches --nodeps

#whereis python|xargs rm -fr

解除安裝yum:

#rpm -qa|grep yum|xargs rpm -e --allmatches --nodeps

#rm -rf /etc/yum.repos.d/*

#whereis yum|xargs rm -fr
 

3.建立目錄python和yum用以存放rpm包：

#mkdir /usr/local/src/python

#mkdir /usr/local/src/yum

4.使用wget分別下載python以及yum的rpm包（注意：一定要和系統的版本號對應）

（1）下載python的rpm包：

#cd /usr/local/src/python        進入目錄

#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-2.7.5-48.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-devel-2.7.5-48.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-libs-2.7.5-48.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/rpm-python-4.11.3-21.el7.x86_64.rpm

（2）下載yum的rpm包：

#cd /usr/local/src/yum        

#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-3.4.3-150.el7.centos.noarch.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm
 

5.安裝python以及yum的rpm包

（1）安裝python:

#cd /usr/local/src/python 

#rpm -ivh python-*   rpm-python-* 

       出現安裝包的依賴問題，此時如下解決即可：

rpm -ivh python-* rpm-python-* –nodeps –force

        --nodeps --force為不考慮依賴包，強制安裝。

        安裝完後即可執行python:


（2）安裝yum:

#cd /usr/local/src/yum 

#rpm -ivh yum-* 

    至此yum重新安裝成功！