升级python到2.7

 眼看着python3 都出来了，vps上用的还是2.4的版本额，确实汗了一把。决定升级下python。

python2.7是2.X的最后一个版本，同时她也加入了一部分3.X的新特性。so 让我们升级吧！

查看系统当前python版本

2: [root@wangyuelou ~]# python

   1:  

   3: Python 2.4.3 (#1, May  5 2011, 16:39:10) 

   4: [GCC 4.1.2 20080704 (Red Hat 4.1.2-50)] on linux2

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

   6: >;>> 

   7: [root@wangyuelou ~]# 

下载新版本的python

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

解压缩 以及编译

   1: [root@wangyuelou ~]# tar xvf Python-2.7.2.tar.bz2 

   2: [root@wangyuelou Python-2.7.2]# ./configure --prefix=/usr/local/python27

   3: [root@wangyuelou Python-2.7.2]# make

   4: [root@wangyuelou Python-2.7.2]# make install

   5: [root@wangyuelou Python-2.7.2]# ls /usr/local/python27/ -al

   6: total 28

   7: drwxr-xr-x  6 root root 4096 Jul 14 00:21 .

   8: drwxr-xr-x 20 root root 4096 Jul 14 00:17 ..

   9: drwxr-xr-x  2 root root 4096 Jul 14 00:21 bin

  10: drwxr-xr-x  3 root root 4096 Jul 14 00:21 include

  11: drwxr-xr-x  4 root root 4096 Jul 14 00:21 lib

  12: drwxr-xr-x  3 root root 4096 Jul 14 00:21 share

覆盖原来的python链接

   1: [root@wangyuelou Python-2.7.2]# mv /usr/bin/python /usr/bin/python_old

   2: [root@wangyuelou Python-2.7.2]# ln -s /usr/local/python27/bin/python /usr/bin/

   3: [root@wangyuelou Python-2.7.2]# python

   4: Python 2.7.2 (default, Jul 14 2011, 00:20:14) 

   5: [GCC 4.1.2 20080704 (Red Hat 4.1.2-50)] on linux2

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

   7: >>> 

此处已经可以正常使用python2.7了

但是因为yum是使用的2.4的版本来用的，所以 还需要修改一下

   1: [root@wangyuelou ~]# yum 

   2: There was a problem importing one of the Python modules

   3: required to run yum. The error leading to this problem was:

   4:  

   5:    No module named yum

   6:  

   7: Please install a package which provides this module, or

   8: verify that the module is installed correctly.

   9:  

  10: It's possible that the above module doesn't match the

  11: current version of Python, which is:

  12: 2.7.2 (default, Jul 14 2011, 00:20:14) 

  13: [GCC 4.1.2 20080704 (Red Hat 4.1.2-50)]

  14:  

  15: If you cannot solve this problem yourself, please go to 

  16: the yum faq at:

  17:   http://wiki.linux.duke.edu/YumFaq

  18:   

  19:  

  20: [root@wangyuelou Python-2.7.2]# vim /usr/bin/yum 

  21:  

  22: #!/usr/bin/python   #修改此处为2.4的位置

  23: [root@wangyuelou ~]# vim /usr/bin/yum 

  24:  

  25: #!/usr/bin/python2.4

  26: [root@wangyuelou ~]# yum 

  27: Loaded plugins: fastestmirror

  28: You need to give some command

  29: usage: yum [options] COMMAND

  30:  

  31: List of Commands:

  32:  

  33: check-update   Check for available package updates

  34: clean          Remove cached data

  35: deplist        List a package's dependencies

  36: downgrade      downgrade a package

  37: erase          Remove a package or packages from your system

  38: groupinfo      Display details about a package group

  39: groupinstall   Install the packages in a group on your system

  40: grouplist      List available package groups

  41: groupremove    Remove the packages in a group from your system

  42: help           Display a helpful usage message

  43: info           Display details about a package or group of packages

  44: install        Install a package or packages on your system

  45: list           List a package or groups of packages

  46: localinstall   Install a local RPM