Make Required Argparse Arguments in Python: Tips for Python Developers

As a Python developer, using argparse to parse command line arguments is essential. However, sometimes you may want to make certain arguments required for your script to function properly. In this article, we'll go over some tips for making required argparse arguments in Python.

├Źndice
  1. Tip 1: Use the Required Parameter
  2. Tip 2: Use the add_argument_group Method
  3. Tip 3: Use the ArgumentDefaultsHelpFormatter Class
  4. Conclusion

Tip 1: Use the Required Parameter

The easiest way to make an argument required is by using the required parameter when defining the argument. This parameter takes a boolean value and defaults to False. Setting it to True will make the argument required.


import argparse

parser = argparse.ArgumentParser()
parser.add_argument("required_arg", help="this argument is required", required=True)
args = parser.parse_args()

print(args.required_arg)

Tip 2: Use the add_argument_group Method

If you have multiple arguments that are required, you may want to group them together. This can be done using the add_argument_group method. You can then set the required parameter for the entire group.


import argparse

parser = argparse.ArgumentParser()
required_group = parser.add_argument_group('required arguments')
required_group.add_argument('arg1', help='this is a required argument', required=True)
required_group.add_argument('arg2', help='this is also a required argument', required=True)
args = parser.parse_args()

print(args.arg1)
print(args.arg2)

Tip 3: Use the ArgumentDefaultsHelpFormatter Class

By default, argparse will display the default value for an argument if it is not provided. If you want to hide the default value for required arguments, you can use the ArgumentDefaultsHelpFormatter class.


import argparse

parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("required_arg", help="this argument is required", required=True)
args = parser.parse_args()

print(args.required_arg)

Conclusion

By using the required parameter, add_argument_group, and ArgumentDefaultsHelpFormatter class, you can easily make required argparse arguments in Python. This will ensure that your script functions properly and that users provide the necessary input.

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