How to use the sys module to obtain command line parameters in Python 3.x

How to use the sys module to obtain command line parameters in Python 3.x

In Python, we often need to pass some parameters from the command line to our program. These command line parameters can help us dynamically configure the behavior of the program. In Python, we can use the sys module to get command line parameters.

sys is a module in the Python standard library, which provides some interpreter-related functions and variables. This includes the ability to get command line arguments. Below we will introduce how to use the sys module to obtain command line parameters.

First, we need to import the sys module. In Python, you can use the import statement to import a module. The code to import the sys module is as follows:

import sys

Next, we can use the argv variable in the sys module to get the command line parameters. argv is a list whose elements are command line arguments separated by spaces. The first element is the name of the script, and the following elements are the parameters passed to the script.

The following is a simple sample code that demonstrates how to use the sys module to get command line parameters and output them:

import sys

# 获取命令行参数
args = sys.argv

# 输出命令行参数
for arg in args:
    print(arg)

Suppose we save the above code as a test.py file. Then execute the following command in the command line:

python test.py hello world

The output result will be:

test.py
hello
world

It can be seen that the first element of the argv list is test.py, and the following elements are hello and world, these are the parameters we pass on the command line.

In addition to obtaining command line parameters, the sys module also provides some other useful functions and variables. For example, the stdin, stdout, and stderr variables in the sys module represent standard input, standard output, and standard error output respectively. In addition, the exit() function in the sys module can be used to exit the program.

To summarize, the sys module provides a convenient way to obtain command line parameters. By using the sys.argv variable, we can obtain the command line arguments and process them in the program. By understanding and using the sys module, we can better control and configure our Python programs.

The above is an article about how to use the sys module to obtain command line parameters. Hope this helps!

Reference:

1. Python 3 Documentation: sys module. https://docs.python.org/3/library/sys.html

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