Python sys 使用说明

#!/usr/bin/python 
# -*- encoding:utf-8 -*- 
# time:2012-07-06 
import sys; 
  print("命令行参数是"); 
 for i in sys.argv: 
      print(i); 
 print ('\n\nPython Path is :',sys.path,'\n'); 

desktop@desktop-desktop:~/shell_learn/python$ python mytest.py a b c d e f  
命令行参数是 
mytest.py 
a 
b 
c 
d 
e 
f 
('\n\nPython Path is :', ['/home/desktop/shell_learn/python', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/pymodules/python2.7/libubuntuone', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/ubuntuone-client', '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-installer', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol'], '\n') 

 Traceback (most recent call last): 
  File "<stdin>", line 1, in <module> 
NameError: name 'sys' is not defined 
类似的错误，解决的办法是在你需要查询的模块是先用import 导入系统模块
如：需要查询sys的用法：
 

>>> import sys 
>>> help (sys) 
Help on built-in module sys: 
 
NAME 
    sys 
 
FILE 
    (built-in) 
 
MODULE DOCS 
    http://docs.python.org/library/sys 
 
DESCRIPTION 
    This module provides access to some objects used or maintained by the 
    interpreter and to functions that interact strongly with the interpreter. 
     
    Dynamic objects: 
     
    argv -- command line argume