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

[Roundup Robot]

Roundup Robot added the comment:

New changeset d5a0698a8354 by Petri Lehtinen in branch 'default':
#11175: argparse.FileType now accepts encoding and errors arguments.
http://hg.python.org/cpython/rev/d5a0698a8354

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nosy: +python-dev

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<http://bugs.python.org/issue11175>
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