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
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