argparse python 3 tutorial

Argparse is a Python module that makes it easy to write user-friendly command-line interfaces. It is particularly useful for creating scripts that can accept various input parameters from the command line. In this tutorial, we'll explore the basics of argparse in Python 3 and provide code examples to help you understand its usage.
Argparse is a module in the Python Standard Library that simplifies the process of parsing command-line arguments. It allows you to define the arguments your script accepts, specify their types, and automatically generate help messages. With argparse, you can create robust and user-friendly command-line interfaces for your Python scripts.
Let's start with a simple example to demonstrate the basic usage of argparse. Suppose you have a script that performs some operation and accepts a filename as an argument.
In this example:
Now, let's see how to run this script from the command line:
Argparse also allows you to define optional arguments. Let's modify the script to accept an optional argument for verbosity.
In this example:
Now, you can run the script with or without the -v flag:
You can combine positional and optional arguments in your script. Let's enhance the script to include an optional argument for setting the processing mode.
In this example:
Now, you can run the script with different processing modes:
Argparse also allows you to handle arguments that can accept multiple values, such as a list of files. Let's modify the script to accept multiple filenames.
In this example:
Now, you can run the script with multiple filenames:
Argparse is a powerful and flexible module for handling command-line arguments in Python. By using it, you can create scripts that are easy to use, understand, and maintain. This tutorial covered the basics, including positional and optional arguments, handling multiple values, and providing help messages. Experiment with argparse to tailor it to your specific script requirements.
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