sys.argv[]是用来获取命令行参数的,sys.argv[0]表示代码本身文件路径,所以参数从1开始,以下两个例子说明:
1、使用sys.argv[]的一简单实例:
以下是sample1.py文件:
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import sys,os print sys.argv os.system(sys.argv[ 1 ]) |
这个例子os.system接收命令行参数,运行参数指令,cmd命令行带参数运行python sample1.py notepad,将打开记事本程序。
2、这个例子是简明python教程上的,明白它之后你就明白sys.argv[]了。
以下是sample.py文件:
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#!/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) |
在与sample.py同一目录下,新建3个记事本文件test.txt,test1.txt,test2.txt,内容如下图:
验证sample.py,如下:
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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 help C:\Users\ 91135 \Desktop>python sample.py - - version [ 'sample.py' , '--version' ] Version 1.2 C:\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> |
总结
以上所述是小编给大家介绍的python sys.argv[]用法实例详解,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://blog.csdn.net/sxingming/article/details/52074311