详解sys.argv[]的使用方法

#!/usr/local/bin/env python
import sys
def readfile(filename):
 '''Print a file to the standard output.'''
 f = file(filename)
 while True:
 line = f.readline()
 if len(line) == 0:
 break
 print line,
 f.close()
print "sys.argv[0]---------",sys.argv[0] 
print "sys.argv[1]---------",sys.argv[1] 
print "sys.argv[2]---------",sys.argv[2]
# Script starts from here
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':
 print 'Version 1.2'
 elif option == 'help':
 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:]:
 readfile(filename)
执行结果:# python test.py --version help
sys.argv[0]--------- test.py
sys.argv[1]--------- --version
sys.argv[2]--------- help
Version 1.2