Centos 5.5默认没有安装sqlite-devel,所以要先安装sqlite-devel,在编译升级python，才可以使用sqlite3。

1.先安装sqlite-devel:

[root@localhost ~]#yum install sqlite-devel -y

2.下载编译安装python2.6.6

[root@localhost ~]#wget -c http://www.python.org/ftp/python/2.6.6/Python-2.6.6.tar.bz2

[root@localhost ~]#tar jxvf Python-2.6.6.tar.bz2

[root@localhost ~]#cd Python-2.6.6

[root@localhost Python-2.6.6]#./configure --with-threads --enable-shared  //默认安装路径：/usr/local/lib/

[root@localhost Python-2.6.6]#make && make install

3.修改系统默认版本

[root@localhost Python-2.6.6]#mv /usr/bin/python /usr/bin/python.bak

[root@localhost Python-2.6.6]#ln -s /usr/local/bin/python2.6 /usr/bin/python

[root@localhost Python-2.6.6]#python -V

Python 2.6.6

4.解决系统python软链接指向python2.6版本后，yum不能正常工作

[root@localhost Python-2.6.6]#vim /usr/bin/yum

#!/usr/bin/python

修改为#!/usr/bin/python2.4

5.如果需要在次编译报错的解决办法

报错信息：python: error while loading shared libraries: libpython2.6.so.1.0: cannot open shared object file: No such file or directory

解决办法：

[root@localhost ~]# vim /etc/ld.so.conf

include ld.so.conf.d/*.conf

/usr/local/lib  ===》需要添加

[root@localhost ~]# ldconfig

[root@localhost ~]# python -V

Python 2.6.6