CentOS 6.* 运行yum报错：No module named rpm

[[email protected] ~]# yum install lrzsz    
There was a problem imporTing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named rpm

Please install a package which provides this module,or
verify that the module is installed correctly.

It‘s possible that the above module doesn‘t match the
current version of Python,which is:
2.6.6 (r266:84292,Jul 23 2015,15:22:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)]

If you cAnnot solve this problem yourself,please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

[[email protected] ~]#

2. 查看yum指向的python是否为2.6.6

[[email protected] ~]# head -1 /usr/bin/yum
#!/usr/bin/python2.6
[[email protected] ~]# ll /usr/bin/python2.6
-rwxr-xr-x 1 root root 4864 7月  24 2015 /usr/bin/python2.6
[[email protected] ~]# /usr/bin/python2.6 --version
Python 2.6.6
[[email protected] ~]#

3. 如果yum不是指向python2.6.6：

修改yum指向到python2.6.6

[[email protected] ~]# vim /usr/bin/yum

# 测试
[[email protected] ~]# yum install lrzsz

4. 如果yum指向的是2.6.6：

则说明centos6.*的python2.6.6损坏，通过rpm重装python2.6.6，须到官网下载指定版本的包：
官网：http://vault.centos.org/6.8/os/x86_64/Packages/

需下载的包：

python
python-iniparse
python-pycurl
python-urlgrabber
python-devel
python-libs
python-setuptools
rpm-python

安装下载的rpm包：

[[email protected] ~]# rpm -ivh *rpm

# 测试yum是否可用
[[email protected] ~]# yum install lrzsz

5. 如果yum不可用，重装yum包。

# 需下载的包：
yum 
yum-Metadata-parser 
yum-utils 
yum-plugin-fastestmirror 
yum-plugin-protectbase 
yum-plugin-aliases 
yum-plugin-downloadonly

# 安装
rpm -ivh yum*

# 测试
[[email protected] ~]# yum install lrzsz