Subprocess ignore all output

Question

I have CLI program that with parameters works automatically, however it still has a TUI (for example something written with curses) which can't be disabled. I am trying :

subprocess.check_call([executable, '-parameter'], stdout=subprocess.DEVNULL)

It disables most of the output, but still there's some left (parts that change). How to completly disable output from it? Thank you.

subprocess also takes input and output pipes, you will want to give it an output pipe — Nullman, Mar 17 '19 at 14:32
Possible duplicate of [How to hide output of subprocess in Python 2.7](https://stackoverflow.com/questions/11269575/how-to-hide-output-of-subprocess-in-python-2-7) — Nullman, Mar 17 '19 at 14:33
[nope](https://stackoverflow.com/a/19961290/7540911) [`With the default settings of None, no redirection will occur; the child’s file handles will be inherited from the parent.`](https://docs.python.org/3.6/library/subprocess.html#frequently-used-arguments) — Nullman, Mar 17 '19 at 14:36
okay. Thank you for explaination. BTW `stdout=FNULL, stderr=subprocess.STDOUT` worked. — Makalone LOgman, Mar 17 '19 at 14:41

score 0 · Answer 1 · answered Oct 15 '19 at 12:47

0

You likely need to redirect both stdout AND stderr.

subprocess.check_call([executable, '-parameter'], 
    stdout=subprocess.DEVNULL,
    stderr=subprocess.DEVNULL
)

answered Oct 15 '19 at 12:47

Matthew Wilcoxson

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Subprocess ignore all output

1 Answers1