[issue16624] subprocess.check_output should allow specifying stdin as a string

[Zack Weinberg]

Zack Weinberg added the comment:

> I think that it will be better not introduce a new argument, but reuse stdin. Just allow io.BytesIO (or perhaps even any file object) be specified as stdin.

If we were designing from scratch I might agree, but we aren't.  Principle of least astonishment says that the API here should match `subprocess.communicate`, and that has separate `stdin=FILE` and `input=STRING` arguments.

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<http://bugs.python.org/issue16624>
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