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自己误将yum卸载，

在重装时由于依赖问题一直报错：

error: Failed dependencies:

    /usr/bin/python is needed by yum-3.4.3-163.el7.centos.noarch

    python >= 2.4 is needed by yum-3.4.3-163.el7.centos.noarch

    python(abi) = 2.7 is needed by yum-3.4.3-163.el7.centos.noarch

    python-iniparse is needed by yum-3.4.3-163.el7.centos.noarch

    python-sqlite is needed by yum-3.4.3-163.el7.centos.noarch

    python-urlgrabber >= 3.10-8 is needed by yum-3.4.3-163.el7.centos.noarch

    rpm-python is needed by yum-3.4.3-163.el7.centos.noarch

    libpython2.7.so.1.0()(64bit) is needed by yum-metadata-parser-1.1.4-10.el7.x86_64

    python(abi) = 2.7 is needed by yum-metadata-parser-1.1.4-10.el7.x86_64

1、查看yum安装包

# rpm -qa | grep yum

yum-plugin-fastestmirror-1.1.31-52.el7.noarch

yum-metadata-parser-1.1.4-10.el7.x86_64

yum-utils-1.1.31-52.el7.noarch   

2、将其全部卸载

#rpm -e yum-plugin-fastestmirror-1.1.31-52.el7.noarch --nodeps

#rpm -e yum-metadata-parser-1.1.4-10.el7.x86_64 --nodeps

#rpm -e yum-utils-1.1.31-52.el7.noarch --nodeps

3、在http://mirrors.163.com/centos/7/os/x86_64/Packages/下载如下20个包

libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm                    

python-ipaddress-1.0.16-2.el7.noarch.rpm  

lvm2-python-libs-2.02.185-2.el7.x86_64.rpm

python-kitchen-1.1.1-5.el7.noarch.rpm     

yum-3.4.3-163.el7.centos.noarch.rpm

python-2.7.5-86.el7.x86_64.rpm                                

python-libs-2.7.5-86.el7.x86_64.rpm       

yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm  

python-pycurl-7.19.0-19.el7.x86_64.rpm    

yum-plugin-aliases-1.1.31-52.el7.noarch.rpm

python-chardet-2.2.1-3.el7.noarch.rpm                         

python-setuptools-0.9.8-7.el7.noarch.rpm  

yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm

python-devel-2.7.5-86.el7.x86_64.rpm                          

python-urlgrabber-3.10-9.el7.noarch.rpm   

yum-plugin-protectbase-1.1.31-52.el7.noarch.rpm

python-iniparse-0.4-9.el7.noarch.rpm                          

rpm-python-4.11.3-40.el7.x86_64.rpm       

yum-utils-1.1.31-52.el7.noarch.rpm

4、下载完成后执行

#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 rpm-python*.rpm yum*.rpm --nodeps --force

5、成功安装

6、如果将python换成python3的话，运行yum会报错

[root@iz2ze3ogy01eqvjs99e8nez python]# yum

  File "/usr/bin/yum", line 30

    except KeyboardInterrupt, e:

                            ^

SyntaxError: invalid syntax

修改 vi /etc/usr/yum 第一行为

#!/usr/bin/python2