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It is common to have an inflexible C wrapper with lots of undesired output. However it is not so trivial to supress (or redirect) that output from Python in a selective way. contextlib.redirect_stdout doesn't help, since it only changes sys.sdout, without touching the actual file descriptor. The following worked for my use case, which I adapted from here http://eli.thegreenplace.net/2015/redirecting-all-kinds-of-stdout-in-python/:
import sys
import os
from contextlib import contextmanager, redirect_stdout
@contextmanager
def supress_stdout():
 devnull = open(os.devnull, 'wb')
 try:
 stdout_flieno = sys.stdout.fileno()
 except ValueError:
 redirect = False
 else:
 redirect = True
 sys.stdout.flush()
 #sys.stdout.close()
 devnull_fileno = devnull.fileno()
 saved_stdout_fd = os.dup(stdout_flieno)
 os.dup2(devnull_fileno, stdout_flieno)
 with redirect_stdout(devnull):
 yield
 if redirect:
 os.dup2(stdout_flieno, saved_stdout_fd)