[issue12776] argparse: type conversion function should be called only once

[Mike Meyer]

Mike Meyer <mwm at mired.org> added the comment:

I've just verified that this patch also fixes 13824 and 11839.
The attached patchfile adds a test to verify that using a non-existent default file fails if you don't specify the argument, and succeeds if you do.

Could someone please apply it?

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nosy: +Mike.Meyer
Added file: http://bugs.python.org/file25438/fopatch

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