[linux]centos7 升级python后出现“No module named yum”错误

There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named yum

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:
2.7.15 (default, May 21 2018, 11:43:18)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

下载下列文件：
python-2.4.3-46.el5_8.2.i386.rpm
python-devel-2.4.3-46.el5_8.2.i386.rpm
python-libs-2.4.3-46.el5_8.2.i386.rpm
python-tools-2.4.3-46.el5_8.2.i386.rpm
tix-8.4.0-11.fc6.i386.rpm
tix-devel-8.4.0-11.fc6.i386.rpm
tkinter-2.4.3-46.el5_8.2.i386.rpm
yum-3.2.22-39.el5.centos.noarch.rpm

下载地址：
http://mirrors.163.com/centos/7/os/x86_64/Packages/

[root@localhost x]# ls
python-2.4.3-46.el5_8.2.i386.rpm tix-8.4.0-11.fc6.i386.rpm
python-devel-2.4.3-46.el5_8.2.i386.rpm tix-devel-8.4.0-11.fc6.i386.rpm
python-libs-2.4.3-46.el5_8.2.i386.rpm tkinter-2.4.3-46.el5_8.2.i386.rpm
python-tools-2.4.3-46.el5_8.2.i386.rpm yum-3.2.22-39.el5.centos.noarch.rpm

[root@localhost x]# rpm -Uvh --replacepkgs *.rpm
Preparing... ########################################### [100%]
1:tix ########################################### [ 13%]
2:tix-devel ########################################### [ 25%]
3:python ########################################### [ 38%]
4:tkinter ########################################### [ 50%]
5:python-devel ########################################### [ 63%]
6:python-libs ########################################### [ 75%]
7:python-tools ########################################### [ 88%]
8:yum ########################################### [100%]
[root@localhost x]# yum update

mv /bin/python2.7 /bin/python2.7.5

# 修改yum文件引用的python版本
vim /usr/bin/yum
#!/bin/python2.7.5  <--- 修改为