python argparse allowed values

Title: A Comprehensive Guide to Python Argparse Allowed Values
The argparse module in Python provides a powerful and flexible way to parse command-line arguments. One of the useful features of argparse is the ability to restrict the allowed values for certain arguments. This tutorial will guide you through the process of using argparse to define allowed values for arguments, ensuring that users provide valid inputs.
Start by importing the argparse module into your Python script.
Create an instance of the ArgumentParser class, which will be used to define and handle command-line arguments.
Add the arguments to the parser using the add_argument method. Specify the choices parameter to restrict the allowed values.
In this example, the --color argument is limited to the choices 'red', 'green', and 'blue'.
Parse the command-line arguments using the parse_args method.
Access the values of the parsed arguments using the attribute notation.
Here's a complete example script incorporating all the steps:
Save the script and run it from the command line. Try providing both valid and invalid values for the --color argument to see how argparse enforces the allowed choices.
By following these steps, you can easily implement argparse with allowed values in your Python scripts, enhancing the robustness and usability of your command-line applications.
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