Example analysis of SYS.ARGV parameter usage in Python

This example describes the use of SYS.ARGV parameters in Python. Share to everyone for your reference. The specific analysis is as follows:

In the process of learning Python, I have been confused about the meaning of sys.argv[, although I know it is a command-line argument, but I still have a bit of a muddle.

Today, a good study, finally is Taichetaiwu.

Sys.argv[] is used to get command-line arguments, Sys.argv[0] represents the file path of the code itself, so the arguments start at 1, and the following two examples illustrate:

1, the use of sys.argv[] a simple example

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1 2	Import Sys,os Os.system (sys.argv[1])

This example Os.system receive command line parameters, run parameter instructions, save as sample1.py, command line with parameters run sample1.py Notepad, will open Notepad program.

2, this example is the concise Python tutorial, understand it after you understand sys.argv[].

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 The

The Save program is sample.py. Let's verify:

Command line with parameter run: Sample.py–version output: Version 1.2

Command line with parameter run: Sample.py–help output result: This program prints files ...

In the same directory as sample.py, create a new a.txt Notepad file, which reads: Test argv; command line with parameters run: sample.py a.txt, Output is a.txt file content: Test argv, here can also take a few more parameters, The program will output the contents of the parameter file successively.

I hope this article will help you with your Python programming.