[docs] [issue22635] subprocess.getstatusoutput changed behavior in 3.4 (maybe 3.3.4?)

[Cassaigne]

Cassaigne added the comment:

I improve the patch a little bit, following the recommendations of the Stinner's review. 
I replace "status" mention by "exit code".

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Added file: http://bugs.python.org/file45077/issue22635-2.diff

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