[issue9509] argparse FileType raises ugly exception for missing file

[akira]

akira <4kir4.1i at gmail.com> added the comment:

"no such file or directory '%s'" is misleading if you are trying to open a readonly file for writing.

The message might be replace by: "can't open '%s'"

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9509>
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