My first answer is to use pytest as they are great to work with and have built-in CliRunner objects, explicitly to help with testing. argparse doesn't have built-in testing tools. But it's got some features that help.
There are also sometimes good reasons to use argparse. Maybe you don't have any other dependencies, why add one just for argument parsing? Maybe you just really like argparse. Honestly, after researching this topic, I might use argparse more. It's got some cool features.
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