CentOS 6.2安装python 2.7

1.查看当前系统中python的版本

[root@zuantianyang-vmlnx ~]# which python

/usr/bin/python

[root@zuantianyang-vmlnx ~]# python --version

Python 2.6.6

2.下载Python 2.7.2

[root@zuantianyang-vmlnx ~]# wget http://python.org/ftp/python/2.7.2/Python-2.7.2.tar.bz2

3.解压Python-2.7.2.tar.bz2

[root@zuantianyang-vmlnx ~]# tar -jxvf Python-2.7.tar.bz2

4.进入刚解压后的文件夹:

[root@zuantianyang-vmlnx ~]#

5.安装:

[root@zuantianyang-vmlnx Python-2.7.2]# ./configure

[root@zuantianyang-vmlnx Python-2.7.2]# make all

[root@zuantianyang-vmlnx Python-2.7.2]# make install

[root@zuantianyang-vmlnx Python-2.7.2]# make clean

[root@zuantianyang-vmlnx Python-2.7.2]#make distclean

默认python被安装到/usr/local/bin/python2.7

[root@zuantianyang-vmlnx Python-2.7.2]#cd /usr/local/bin

[root@zuantianyang-vmlnx bin]# ls -lrt

total 12028
-rwxr-xr-x. 1 root root   18547 Feb  5 13:56 smtpd.py
-rwxr-xr-x. 1 root root      84 Feb  5 13:56 pydoc
-rwxr-xr-x. 1 root root      99 Feb  5 13:56 idle
-rwxr-xr-x. 1 root root     101 Feb  5 13:56 2to3
-rwxr-xr-x. 2 root root 6139442 Feb  5 13:59 python2.7
-rwxr-xr-x. 2 root root 6139442 Feb  5 13:59 python
-rwxr-xr-x. 1 root root    1624 Feb  5 14:01 python2.7-config
lrwxrwxrwx. 1 root root      16 Feb  5 14:01 python-config -> python2.7-config

6.备份系统中原来的python 2.6.6

[root@zuantianyang-vmlnx ~]# mv /usr/bin/python  /usr/bin/python2.6.6.bak
[root@zuantianyang-vmlnx ~]# ln -s /usr/local/bin/python2.7 /usr/bin/python

[root@zuantianyang-vmlnx ~]# cd /usr/bin/
[root@zuantianyang-vmlnx bin]# ls -lrt python
lrwxrwxrwx. 1 root root 9 Feb  5 14:14 python -> /usr/local/bin/python2.7

CentOS 6.2上Python 2.7安装成功了！

但是yum还有些问题

[root@zuantianyang-vmlnx ~]# yum list
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&#39s possible that the above module doesn&#39t match the
current version of Python, which is:
2.7.2 (default, Feb  5 2012, 13:55:54)
[GCC 4.4.6 20110731 (Red Hat 4.4.6-3)]

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

[root@zuantianyang-vmlnx ~]# vi /usr/bin/yum

用的是/usr/bin/python Python 2.7.2

要在python2.7下yum工作要升级一大堆的包，还是使用下面的简便方法让yum工作吧。
将#!/usr/bin/python改为#!/usr/bin/python2.6使用原来系统默认的Python,yum可以工作了。

[root@zuantianyang-vmlnx ~]# yum --version
3.2.29
  Installed: rpm-4.8.0-19.el6.x86_64 at 2011-12-22 12:15
  Built    : CentOS BuildSystem <http://bugs.centos.org> at 2011-12-07 21:34
  Committed: Panu Matilainen <pmatilai@redhat.com> at 2011-10-04

  Installed: yum-3.2.29-22.el6.centos.noarch at 2011-12-22 12:16
  Built    : CentOS BuildSystem <http://bugs.centos.org> at 2011-12-08 18:18
  Committed: Karanbir Singh <kbsingh@centos.org> at 2011-12-07

  Installed: yum-plugin-fastestmirror-1.1.30-10.el6.noarch at 2011-12-22 12:15
  Built    : CentOS BuildSystem <http://bugs.centos.org> at 2011-12-07 21:07

  Committed: James Antill <james.antill@redhat.com> at 2011-09-21

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今天开机后发现，输入法的状态栏不见了，去系统输入法设置，发现无法加载，查看自己目录下的.xsession-errors文件，发现pygtk和一些模块无法加载，

安装的话要装很多包来升级，干脆link /usr/bin/python2.6到 /usr/bin/python

rm /usr/bin/python

ln -s /usr/bin/python2.6 python

ln -s /usr/local/bin/python2.7 /usr/bin/python2.7

并且把/usr/local/bin/python 备份成 /usr/local/bin/python.bak,因为这个python是2.7的.

使用python2.7的话需要用/usr/bin/python2.7  给python 2.7安装模块的时候也需要制定路径,

等CentOS升级到python 2.7吧!