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From: Peter Otten <__peter__@web.de>
Subject: Re: Piping processes works with 'shell = True' but not otherwise.
Date: Fri, 31 May 2013 11:52:41 +0200
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Xref: csiph.com comp.lang.python:46588

Luca Cerone wrote:

>> 
>> That's because stdin/stdout/stderr take file descriptors or file
>> 
>> objects, not path strings.
>> 
> 
> Thanks Chris, how do I set the file descriptor to /dev/null then?

For example:

with open(os.devnull, "wb") as stderr:
    p = subprocess.Popen(..., stderr=stderr)
    ...


In Python 3.3 and above:

p = subprocess.Popen(..., stderr=subprocess.DEVNULL)