python sys.argv[]用法实例详解

import sys,os  print sys.argv os.system(sys.argv[1]) 

#!/usr/bin/env python  #_*_ coding:utf-8 _*_  import sys   def readfile(filename): #定义readfile函数，从文件中读出文件内容     '''''''''Print a file to the standard output.'''     f = file(filename)     while True:       line = f.readline()       if len(line) == 0:         break       print line, # notice comma 分别输出每行内容     f.close()   # Script starts from here  print sys.argv  if len(sys.argv) < 2:     print 'No action specified.'     sys.exit()   if sys.argv[1].startswith('--'):     option = sys.argv[1][2:]     # fetch sys.argv[1] but without the first two characters     if option == 'version': #当命令行参数为-- version，显示版本号       print 'Version 1.2'     elif option == 'help': #当命令行参数为--help时，显示相关帮助内容       print ''' This program prints files to the standard output.  Any number of files can be specified.  Options include:   --version : Prints the version number   --help  : Display this help'''     else:       print 'Unknown option.'     sys.exit()   else:     for filename in sys.argv[1:]: #当参数为文件名时，传入readfile，读出其内容       readfile(filename)  

C:/Users/91135/Desktop>python sample.py ['sample.py']No action specified.C:/Users/91135/Desktop>python sample.py --help['sample.py', '--help']This program prints files to the standard output. Any number of files can be specified. Options include:  --version : Prints the version number --help  : Display this helpC:/Users/91135/Desktop>python sample.py --version ['sample.py', '--version']Version 1.2C:/Users/91135/Desktop>python sample.py --ok ['sample.py', '--ok']Unknown option.C:/Users/91135/Desktop>python sample.py test.txt ['sample.py', 'test.txt']hello python!C:/Users/91135/Desktop>python sample.py test.txt test1.txt test2.txt ['sample.py', 'test.txt', 'test1.txt', 'test2.txt'] hello python! hello world!hello wahaha!goodbye!C:/Users/91135/Desktop>