默认python版本的更改

[root@localhost bin]# cd /usr/local/bin
[root@localhost bin]# ll
total 5040
-rwxr-xr-x 1 root root     367 Jan 19 17:45 pip
-rwxr-xr-x 1 root root     369 Jan 19 17:45 pip2
-rwxr-xr-x 1 root root     373 Jan 19 17:45 pip2.7
-rwxr-xr-x 1 root root      84 Jan 21 12:26 pydoc
-rwxr-xr-x 1 root root     223 Jan 19 17:47 pygmentize
lrwxrwxrwx 1 root root      18 Feb  7 13:40 python -> /usr/bin/python2.6
lrwxrwxrwx 1 root root       9 Jan 21 12:28 python2 -> python2.7
-rwxr-xr-x 1 root root 4635628 Jan 21 12:27 python2.7
-rwxr-xr-x 1 root root    1624 Jan 21 12:28 python2.7-config
lrwxrwxrwx 1 root root      16 Jan 21 12:28 python2-config -> python2.7-config
lrwxrwxrwx 1 root root      14 Jan 21 12:28 python-config -> python2-config
-rwxr-xr-x 1 root root   18547 Jan 21 12:26 smtpd.py
-rwxr-xr-x 1 root root   97298 Jan 19 22:11 sqlite3
[root@localhost bin]# rm python
rm: remove symbolic link `python'? y
[root@localhost bin]# ln -s /usr/local/bin/python2.7 /usr/local/bin/python  # 改为2.7版本
[root@localhost bin]# python -V
Python 2.7.3
[root@localhost bin]# rm python
rm: remove symbolic link `python'? y
[root@localhost bin]# ln -s /usr/bin/python2.6 /usr/local/bin/python  # 改为2.6版本
[root@localhost bin]# python -V
Python 2.6.6

记录：为安装Numpy和Scipy，下载了python2.7，并把系统默认的python指向python2.7。但在使用setup配置时，发现网络配置点下去没有反应，报错" No module named snack "，怀疑python版本原因，故将系统默认的python指向python2.6，再将[ ln -s /usr/bin/python2.6 /usr/bin/python ]问题解决。

参考：http://www.cnblogs.com/wnzhong/p/6308669.html