python 如何设置加载其他目录脚本文件

[root@localhost ~]# python
Python 2.6.6 (r266:84292, Nov 22 2013, 12:16:22) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>> import tab
>>> import sys

>>> sys.path.append('目录路径')
>>>现在可以愉快的加载该目录下的python脚本了