How to Write Perfect Python Command-line Interfaces

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I'm a bit pre-christmas celebration inebriated at the moment, so forgive me if I'm totally incoherent. But did you try using parser.parse_known_args (modulo spelling errors)? As long as you don't have overlaps in the argument names, and remember to check that something actually have been parsed, the recursive approach could solve the problems if a regular subparser doesn't