[issue17814] Popen.stdin/stdout/stderr documentation should mention object type

[Ezio Melotti]

Ezio Melotti added the comment:

I think the specific classes are an implementation detail, but mentioning if the file object is a bytes or text stream seems reasonable.
(Also it's better if you attach patches, instead of pasting them in the message.)

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nosy: +ezio.melotti
stage:  -> needs patch
versions: +Python 2.7, Python 3.3, Python 3.4

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