[issue9509] argparse FileType raises ugly exception for missing file

[Steven Bethard]

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

I'm not sure about the patch - this will convert *all* IOErrors into command line error messages, while we should really only be converting the ones raised by FileType. Instead, the try/except should be in FileType.__call__, and you should raise an ArgumentTypeError there.

The test looks fine.

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