[Python-Dev] documentation / implementation question for subprocess.check_output

Guido van Rossum guido at python.org
Thu Jul 16 12:35:58 CEST 2015

In which version? I don't see that phrase in the 3.5 docs.

On Thu, Jul 16, 2015 at 9:52 AM, Chris Withers <chris at simplistix.co.uk>

> Hi All,
> Curious to see this in the docs for subprocess.check_output: "Do not use
> stderr=PIPE with this function as that can deadlock based on the child
> process error volume. Use Popen with the communicate() method when you need
> a stderr pipe."
> Given that check_output's implementation uses communicate(), how could
> stderr=PIPE cause a deadlock in a way that wouldn't happen if you called
> Popen.communicate() yourself?
> cheers,
> Chris
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--Guido van Rossum (python.org/~guido)
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