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

[paul j3]

paul j3 added the comment:

http://stackoverflow.com/a/35144270/901925
dynamically-set-default-value-from-cfg-file-through-argparse-python

is my answer to a similar recent (Feb 2015) SO question.

I rather like the idea of using collections.ChainMap on the dictionary versions of the namespace and config data.

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<http://bugs.python.org/issue26394>
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