Suppress stdout / stderr print from Python functions

Question

I have a Python script that is using some closed-box Python functions (i.e. I can\'t edit these functions) provided by my employer. When I call these functions, they are pri

Answer 1

If you are running this script on a linux based machine, you should be able to:

$> ./runscript.py > output.txt

Answer 2

python 3.6 working version, tested with million suppressions without any errors

import os
import sys

class suppress_stdout_stderr(object):
    def __enter__(self):
        self.outnull_file = open(os.devnull, 'w')
        self.errnull_file = open(os.devnull, 'w')

        self.old_stdout_fileno_undup    = sys.stdout.fileno()
        self.old_stderr_fileno_undup    = sys.stderr.fileno()

        self.old_stdout_fileno = os.dup ( sys.stdout.fileno() )
        self.old_stderr_fileno = os.dup ( sys.stderr.fileno() )

        self.old_stdout = sys.stdout
        self.old_stderr = sys.stderr

        os.dup2 ( self.outnull_file.fileno(), self.old_stdout_fileno_undup )
        os.dup2 ( self.errnull_file.fileno(), self.old_stderr_fileno_undup )

        sys.stdout = self.outnull_file        
        sys.stderr = self.errnull_file
        return self

    def __exit__(self, *_):        
        sys.stdout = self.old_stdout
        sys.stderr = self.old_stderr

        os.dup2 ( self.old_stdout_fileno, self.old_stdout_fileno_undup )
        os.dup2 ( self.old_stderr_fileno, self.old_stderr_fileno_undup )

        os.close ( self.old_stdout_fileno )
        os.close ( self.old_stderr_fileno )

        self.outnull_file.close()
        self.errnull_file.close()

Answer 3

This approach (found through the related sidebar) might work. It reassigns the file descriptors rather than just the wrappers to them in sys.stdout, etc.