How to exclude a specific message from stdout when using apt in python script?

Question

I get this message: "WARNING: apt does not have a stable CLI interface. Use with caution in scripts."

In a simple script that does

process = subprocess.Popen(['apt', 'upgrade', '-y'], stdout=subprocess.PIPE)

How can I remove that annoying warning when running apt from python subprocess? I don't mind the rest of the output, I only want to get rid of the warning.

Edit:

I'm iterating though the output so that I can get live output from apt. How can I remove it from there?

with open('test.log', 'w') as f:
        process = subprocess.Popen(['apt', 'upgrade', '-y'],
                                   stdout=subprocess.PIPE,  stderr=subprocess.PIPE)
        for line in iter(process.stdout.readline, ''):
                sys.stdout.write(line)
                f.write(line)

Blender · Accepted Answer · 2017-11-07 06:30:21Z

1

That message is sent over stderr. I would capture it by piping it, just like you did with stdout:

>>> process = subprocess.Popen(['apt', 'search', 'python'], stdout=subprocess.PIPE,
...                                                         stderr=subprocess.PIPE)
>>> stdout, stderr = process.communicate()
>>> stderr
'\nWARNING: apt does not have a stable CLI interface. Use with caution in scripts.\n\n'

answered Nov 7, 2017 at 6:30

Blender

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3 Comments

answerSeeker Over a year ago

Hi thanks for the answer, please see my updated question. I'm still not sure how to exclude that warning yet.

Blender Over a year ago

@answerSeeker: Your updated code doesn't produce that message for me.

answerSeeker Over a year ago

Ahh thanks!. I thought it'd be the same but the stderr=subprocess.PIPE really fixed it

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