How to use the sys.argv [] method in python

It is believed that many inexperienced people have no idea about how to use the sys.argv [] method in python. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Sys.argv [] is used to get command-line arguments, and sys.argv [0] represents the file path of the code itself, so start with the second, sys.argv [1].

Note: parameters are separated by spaces

Create a file called sysargv.py with the following contents:

Import sys

Print ('the first argv:', sys.argv [0],'\ n') # shows the first parameter

Print ('the second argv:', sys.argv [1],'\ n') # shows the second parameter

Print ('the third argv:', sys.argv [2],'\ n') # shows the third parameter, and so on

The results of the execution are as follows:.

E:\ lib > learnsysargv.py yang.txt yangqilong

The first argv: e:\ lib\ learnsysargv.py-- the path to the pyython file

The second argv: yang.txt-- Parameter 1

The third argv: yangqilong-- Parameter 2

I revised an example in the official textbook.

Import sys

Print ('the first argv:', sys.argv [0])

Print ('the second argv:', sys.argv [1])

# print ('the third argv:', sys.argv [2])

If len (sys.argv)

< 2: print ('No action specified.') sys.exit() 解释一下下面IF语句的语法：判断参数1是否是以'--'开头 if sys.argv[1].startswith('--'): ption = sys.argv[1][2:]//把参数1从第三个字符开始的字符串赋值给 option（去掉'--'字符），直到参数1后面的空格。 # fetch sys.argv[1] but without the first two characters if ption == 'v': print ('Version 1.2') elif option == 'h': print ('This program prints files to the standard output.\nAny number of files can be specified.\n\ Options include:\n\ --v : Prints the version number\n\ --h : Display this help') 程序输出结果： E:\lib>

Sysargv.py-- h

The first argv: e:\ lib\ sysargv.py

The second argv:-h

This program prints files to the standard output.

Any number of files can be specified.

Options include:

-v: Prints the version number

-h: Display this help

E:\ lib > sysargv.py-- v

The first argv: e:\ lib\ sysargv.py

The second argv:-- v

Version 1.2

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