[issue11175] allow argparse FileType to accept encoding and errors arguments

[Lucas Maystre]

Lucas Maystre added the comment:

Alright, here's a version with more tests (unittest.mock is awesome!). I think it tests exactly what it should (and no more), i.e. that the arguments are correctly passed to `open`.

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Added file: http://bugs.python.org/file27729/filetype11175.patch

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