[issue23342] run() - unified high-level interface for subprocess

[Thomas Kluyver]

Thomas Kluyver added the comment:

Fourth version of patch, responding to review comments on Rietveld. The major changes are:

- Eliminated the corner case when passing input=None to run() - now it's a real default parameter. Added a shim in check_output to keep it behaving the old way in case anything is relying on it, but I didn't document it.
- The docstring of run() was shortened quite a bit by removing the examples.
- Added a whatsnew entry

I also made various minor fixes - thanks to everyone who found them.

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Added file: http://bugs.python.org/file38072/subprocess_run4.patch

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<http://bugs.python.org/issue23342>
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