好久不寫博文了，本文沒什麼含金量，只是做一個記錄。便於日後翻閱。

0.作業系統資訊

[[email protected] ~]$ cat /etc/issue

CentOS release 6.4 (Final)

Kernel \r on an \m

1.當前python版本資訊

[[email protected] bin]$ pwd

/usr/bin

[[email protected] bin]$ ll -a python

-rwxr-xr-x. 2 root root 4864 2月  22 2013 python

[[email protected]

Python 2.6.6 (r266:84292, Feb 22 2013, 00:00:18) 

[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> 

2.刪掉當前python

[[email protected] bin]$ sudo rm -rf python

3.下載且安裝2.7.6安裝包

[[email protected] download]$ ll Python-2.7.6.tgz 

-rw-r--r-- 1 vagrant vagrant 14725931 5月  14 2014 Python-2.7.6.tgz

[[email protected] Python-2.7.6]$ ./configure &&  make && sudo make install 

4.製作軟連線把python2.7.6指向python

[[email protected] bin]$ sudo ln -s /usr/local/bin/python2.7 python

[[email protected] bin]$ pwd

/usr/bin

[[email protected] bin]$ ll python

lrwxrwxrwx 1 root root 24 2月  14 14:29 python ->/usr/local/bin/python2.7

ok,現在的python環境切換成2.7.6了。

[[email protected] ~]$ python

Python 2.7.6 (default, Feb 14 2015, 14:13:13) 

[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> 

python是升級成功了，可是yum不能使用了。。。

[[email protected] webservice]$ yum

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:

2.7.6 (default, Feb 14 2015, 14:13:13) 

[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)]

If you cannot solve this problem yourself, please go to 

the yum faq at:

  http://yum.baseurl.org/wiki/Faq

找不到yum模組了

解決方法：

[[email protected] webservice]$ vi /usr/bin/yum 

編輯第一行

#!/usr/bin/python

import sys

try:

#!/usr/bin/python2.6

import sys

try:

[[email protected] webservice]$ yum --version

3.2.29

  Installed: rpm-4.8.0-32.el6.x86_64 at 2013-11-03 07:59

  Built    : CentOS BuildSystem <http://bugs.centos.org> at 2013-02-22 02:13

  Committed: Florian Festi <[email protected]> at 2012-11-15

  Installed: yum-3.2.29-40.el6.centos.noarch at 2013-11-03 07:59

  Built    : CentOS BuildSystem <http://bugs.centos.org> at 2013-02-22 11:26

  Committed: Johnny Hughes <[email protected]> at 2013-02-21

  Installed: yum-plugin-fastestmirror-1.1.30-14.el6.noarch at 2013-11-03 07:59

  Built    : CentOS BuildSystem <http://bugs.centos.org> at 2012-06-22 12:23

  Committed: Zdenek Pavlas <[email protected]> at 2012-04-26

參考：http://see.sl088.com/wiki/Centos5_升級Python