[issue26394] Have argparse provide ability to require a fallback value be present

[Michael Herold]

Michael Herold added the comment:

I have prepared a working patch to sketch how this could be implemented. A small example (example.py) shows how this feature can be used to implement a fallback to environment variables.

This patch allows Currying of positional arguments (i.e. you can give position 2 via fallback and provide position 1 via the command line). However, I think this might be too confusing and implicit.

Please let me know whether I should prepare a proper patch.

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keywords: +patch
Added file: http://bugs.python.org/file42061/argparse-wip-1.patch

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