python argparse allowed values

Title: A Guide to Python Argparse Allowed Values with Code Examples
Argparse is a powerful module in Python for parsing command-line arguments. It allows you to define the arguments your script accepts and provides a convenient way for users to interact with your program through the command line. In this tutorial, we'll explore how to use argparse to restrict input values to a predefined set, ensuring that users provide only valid inputs.
Begin by importing the argparse module. This can be done with the following code:
Create an instance of the ArgumentParser class. This object will be used to define and manage the command-line arguments.
Define the arguments your script will accept. For arguments with allowed values, use the choices parameter to specify the valid options.
In this example, the --color argument is restricted to the values 'red', 'green', and 'blue'.
Parse the command-line arguments using the parse_args() method.
Access the values of the parsed arguments using the attribute names you provided when defining the arguments.
Save your script and run it from the command line, providing the required arguments.
Here's the complete code for a simple script that uses argparse with allowed values:
This will print:
Try running the script with an invalid color to see how argparse enforces the allowed values.
Using argparse with allowed values is a handy way to ensure that your script receives valid inputs. It enhances the usability of your command-line tools and helps prevent unexpected errors. Experiment with different argument types and constraints to build robust and user-friendly command-line interfaces for your Python scripts.
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