[docs] [issue14149] argparse: Document how to use argument names that are not Python identifiers

[Steven Bethard]

Steven Bethard <steven.bethard at gmail.com> added the comment:

> making Namespace subscriptable

This has been discussed before - see issue 11076. I prefer to keep Namespace as simple as possible. For subscripting, just use the standard Python idiom of vars as suggested in the docs:

http://docs.python.org/library/argparse.html#the-namespace-object

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