第一步：下载python2.7.4版本源码：
wget http://python.org/ftp/python/2.7.4/Python-2.7.4.tgz
解压文件
[aa@localhost ~]$ tar jxvf Python-2.7.4.tar.bz2
[niuxl@localhost ~]$ cd Python-2.7.4
[niuxl@localhost Python-2.7.4]$ ls
config.guess configure Demo Grammar install-sh LICENSE Makefile.pre.in Modules Parser PCbuild Python RISCOS Tools
config.sub configure.ac Doc Include Lib Mac Misc Objects PC pyconfig.h.in README setup.py
[niuxl@localhost Python-2.7.4]$ su -
口令：
[root@localhost ~]# mkdir /usr/local/python2.7.4
[root@localhost ~]# cd /home/
[root@localhost home]# cd niuxl/Python-2.7.4
[root@localhost Python-2.7.4]# ls
config.guess configure Demo Grammar install-sh LICENSE Makefile.pre.in Modules Parser PCbuild Python RISCOS Tools
config.sub configure.ac Doc Include Lib Mac Misc Objects PC pyconfig.h.in README setup.py
编译之前，需要先安装zlib包：
[root@localhost Python-2.7.4]# yum install zlib zlib-devel
[root@localhost Python-2.7.4]# ./configure --prefix=/usr/local/python2.7.4
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for --enable-universalsdk... no
checking for --with-universal-archs... 32-bit
checking MACHDEP... linux2
checking EXTRAPLATDIR...
checking for --without-gcc... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/home/niuxl/Python-2.7.4':
configure: error: no acceptable C compiler found in $PATH
缺少c编辑器
安装c编辑器：
[root@localhost Python-2.7.4]# yum install gcc
..略
注：有一个选择y和n的地方，提示是否继续下载，输入y，回车即可！
gcc安装完成
继续编译python
[root@localhost Python-2.7.4]# ./configure --prefix=/usr/local/python2.7.4
..(略)
ok编译成功
[root@localhost Python-2.7.4]# make && make install
安装成功
[root@localhost Python-2.7.4]# python -V
Python 2.4.3
目前版本依然是2.4.3，现在开始升级python，
查看python命令所在目录
[root@localhost Python-2.7.4]# whereis python
python: /usr/bin/python2.4 /usr/bin/python /usr/lib/python2.4 /usr/include/python2.4 /usr/share/man/man1/python.1.gz
将/usr/bin/python 的软连接修改为python2.4.3
[root@localhost Python-2.7.4]# mv /usr/bin/python /usr/bin/python2.4.3
[root@localhost Python-2.7.4]# python
-bash: /usr/bin/python: 没有那个文件或目录
python命令找不到，这时只需要将版本python2.7.4命令加入环境变量即可！
方式1：
修改/etc/profile加入如下两行：
PATH=$PATH:/usr/local/python2.7.4/bin
export PATH
然后
[root@localhost Python-2.7.4]# source /etc/profile
[root@localhost Python-2.7.4]# python -V
Python 2.7.4
当然也可以创建2.7.4版本的python的软连接：/usr/bin/python
[root@localhost ~]# ln -s /usr/local/python2.7.4/bin/python /usr/bin/python
亦可
ok，python升级完成
到现在为止，还有最后一件事需要做，那就是yum与python的兼容问题：
[root@localhost pipe]# vi /usr/bin/yum
#!/usr/bin/python
第一行修改为
#!/usr/bin/python2.4.3（即原始的python变更后的名字）
