centos5.5 下安装python2.7.2

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查看centos5.5默认python版本

[root@Django ~]# python
Python 2.4.3 (#1, Sep 3 2009, 15:37:12)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

下载python2.7.2

[root@Django ~]# wget http://python.org/ftp/python/2.7.2/Python-2.7.2.tgz

安装python2.7.2

[root@Django ~]# tar xvf Python-2.7.2.tgz[root@Django ~]# cd Python-2.7.2[root@Django Python-2.7.2]# ./configure[root@Django Python-2.7.2]# make && make install

python2.7 默认安装在/usr/local/lib/python2.7

查看安装的python2.7

[root@Django Python-2.7.2]# /usr/local/bin/python
Python 2.7.2 (default, Apr 5 2012, 14:37:00)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

[root@Django Python-2.7.2]# /usr/local/bin/python -V
Python 2.7.2

这个时候系统默认的python还是

[root@Django Python-2.7.2]# python
Python 2.4.3 (#1, Sep 3 2009, 15:37:12)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

修改系统默认的python（为什么不删除默认的python呢，这是因为yum是基于2.4.3的）

[root@Django Python-2.7.2]# mv /usr/bin/python /usr/bin/python.bak

[root@Django Python-2.7.2]# ln -s /usr/local/bin/python2.7 /usr/bin/python

这个时候我们修改了系统默认的python 版本为2.7 但是yum 是基于2.4的，如果这个时候你使用yum服务是会出错的

恢复不能使用的yum yum-update

[root@Django Python-2.7.2]# vi /usr/bin/yum

[root@mysqlnode2 ~]# vim /usr/sbin/yum-updatesd

将首行显示的 !#/usr/bin/python 修改为 !#/usr/bin/python2.4

为了后续方便软件的安装，需要使用easy_install ,则需要安装Setuptools模块

下载

[root@Django ~]# wget http://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg#md5=fe1f997bc722265116870bc7919059ea

安装

[root@Django ~]# sh setuptools-0.6c11-py2.7.egg
Processing setuptools-0.6c11-py2.7.egg
Copying setuptools-0.6c11-py2.7.egg to /usr/local/lib/python2.7/site-packages
Adding setuptools 0.6c11 to easy-install.pth file
Installing easy_install script to /usr/local/bin
Installing easy_install-2.7 script to /usr/local/bin

Installed /usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg
Processing dependencies for setuptools==0.6c11
Finished processing dependencies for setuptools==0.6c11