[issue9509] argparse FileType raises ugly exception for missing file

[SilentGhost]

SilentGhost <michael.mischurow+bpo at gmail.com> added the comment:

Steven, I'm not sure why you're insisting on ArgumentTypeError, when it should be ArgumentError. The file name is not coerced into a different file type, but rather the error occurs when trying to use parameter passed.

In any way, my patch is still available. Do you not like something about it?

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