Web Reference: One of the few 'patches' to argparse in the last Python release changed how it tests for 'required' arguments. Unfortunately it introduced this bug regarding subparsers. This needs to be fixed in the next release (if not sooner). 1 day ago · For a more gentle introduction to Python command-line parsing, have a look at the argparse tutorial. The argparse module makes it easy to write user-friendly command-line interfaces. The program defines what arguments it requires, and argparse will figure out how to parse those out of sys.argv. Oct 20, 2025 · By default, argparse lets the user run the script without providing any subcommand (e.g., just mytool.py). If you want to force the user to provide one, you need to use the required=True argument (available in Python 3.7+)
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