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

[Guido van Rossum]

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>
wrote:

> 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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