Python disable logging for command line module

Question

What I'm trying to do seems really simple but I can't find a way to do it. I'm trying to use the module Pipreqs in a script, but I have to use subprocess.call() because Pipreqs doesn't have a way to use it in a script. Pipreqs uses logging to log info and I don't want that. Pipreqs also doesn't have a quiet mode. I tried to use logger.setLevel(logging.WARNING) but since I'm calling it through subprocess.call() it still prints info. I've also tried importing Pipreqs and setting the logging level to warning and that also doesn't work. Is there any way to disable this output? My code right now is the following:

import subprocess
import logging
import pipreqs
logger = logging.getLogger("pipreqs")
logger.setLevel(logging.WARNING)
subprocess.call(["pipreqs", "--force","/path/to/dir"])

I haven't tried redirecting is to PIPE, but I've tried redirecting is to /dev/null and that didn't work. I could try redirecting it to PIPE but I don't want to buffer to fill up and I'm not even sure if that would work — BBFC Gaming
– BBFC Gaming, Commented Jun 27, 2020 at 20:10

Hans Musgrave · Accepted Answer · 2020-06-27 20:07:43Z

2

You won't have access to the logger for an external process. The subprocess module does have flags for disabling output though.

subprocess.call(
  ["pipreqs", "--force","/path/to/dir"],
  stdout=subprocess.DEVNULL,
  stderr=subprocess.DEVNULL
)

answered Jun 27, 2020 at 20:07

Hans Musgrave

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2 Comments

BBFC Gaming Over a year ago

Thanks! I tried that before, but using a different way. I guess my way doesn't work

Hans Musgrave Over a year ago

Yeah, stdout/stderr redirection isn't entirely uniform yet. E.g. contextlib.redirect_stdout() doesn't work for subprocesses, and it doesn't work for output generated by the logging module either -- even by the same process.

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