[issue42457] ArgumentParser nested subparsers resolve paths in improper order

[Alexey Izbyshev]

Change by Alexey Izbyshev :


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nosy: +rhettinger
versions:  -Python 3.6, Python 3.7

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[issue42457] ArgumentParser nested subparsers resolve paths in improper order

[Carson Wilber]

New submission from Carson Wilber :

ArgumentParser improperly resolves arguments in an improper order when using 
nested subparsers if there are required arguments at more than one layer.

A minimum viable reproduction is to create a set of subparsers on a primary 
parser, and a set of subparsers on at least one of those parsers. On the main 
parser and the first-level subparser, add a required argument (in any position 
as they are appended to the end.)

If you attempt to, for example, print the help for a second-level subparser, an 
error will be thrown and the parser will exit due to the required argument(s) 
not being provided, despite the expected behavior and the nature of the -h flag 
not requiring those arguments to be provided.

For lack of an appropriate means to show a complete minimum viable reproduction 
here, please see this StackOverflow thread I initially created believing this 
to be user error (having now determined this is a bug in behavior):

https://stackoverflow.com/questions/64908447/printing-help-for-nested-subparsers-with-required-positional-arguments

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messages: 381789
nosy: carsonwilber
priority: normal
severity: normal
status: open
title: ArgumentParser nested subparsers resolve paths in improper order
type: behavior
versions: Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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