python sys.argv[]

sys.argv[]是用来获取命令行参数的，是一个由该脚本自身路径和其它输入的参数组成的List。sys.argv[0]表示代码本身文件路径。

这里，当我们执行python using_sys.py we are arguments的时候，我们使用python命令运行using_sys.py模块，后面跟着的内容被作为参数传递给程序。Python为我们把它存储在sys.argv变量中。记住，脚本的名称总是sys.argv列表的第一个参数。所以，在这里，'using_sys.py'是sys.argv[0]、'we'是sys.argv[1]、'are'是sys.argv[2]以及'arguments'是sys.argv[3]。注意，Python从0开始计数，而非从1开始。

# -*- coding:utf-8 -*-

from sys import argv

script,first,second,third=argv

print "The script is called:",script

print "Your first variable is:", first

print "Your second variable is:",second

print "Your third variable is:",third

> python ex13.py first,2nd,3th

The script is called: ex13.py

Your first variable is: first

Your second variable is: 2nd

Your third variable is: 3th

# -*- coding:utf-8 -*-

import sys

def readfile(filename):

    f=file(filename)

    while True:

        line=f.readline()

        if len(line)==0:

            break

        print line

    f.close()

if len(sys.argv)<2:

    print "No action specofied."

    sys.exit()

for i in range(len(sys.argv)):

    print "sys.argv[%d]-----%s" %(i,sys.argv[i])

if sys.argv[1].startswith('--'):

    option=sys.argv[1][2:]

    #fetch sys.argv[1] without the first two characters

    if option == "version":

        print "Version 1.2"

    if 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

           ex13_2.py filename : will display content in file

           """

    if option not in ["version","help"]:

        print "Unknow option."

        sys.exit()

else:

    for filename in sys.argv[1:]:

        readfile(filename)

> python ex13_3.py

No action specofied.

> python ex13_3.py --version

sys.argv[0]-----ex13_3.py

sys.argv[1]-------version

Version 1.2

> python ex13_3.py --help

sys.argv[0]-----ex13_3.py

sys.argv[1]-------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 help

                   ex13_2.py filename : will display content in file

> python ex13_3.py 1.txt 2.txt

sys.argv[0]-----ex13_3.py

sys.argv[1]-----1.txt

sys.argv[2]-----2.txt

test for sys.argv

test2

> python ex13_3.py 1.txt

sys.argv[0]-----ex13_3.py

sys.argv[1]-----1.txt

test for sys.argv

> python ex13_3.py 1.txt 2.txt

sys.argv[0]-----ex13_3.py

sys.argv[1]-----1.txt

sys.argv[2]-----2.txt

test for sys.argv

test2

> python ex13_3.py 1.txt 2.txt 3.txt

sys.argv[0]-----ex13_3.py

sys.argv[1]-----1.txt

sys.argv[2]-----2.txt

sys.argv[3]-----3.txt

test for sys.argv

test2

test3

巴特西

python sys.argv[]

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