New submission from Zahari Dim:
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)
----------
components: Extension Modules, Library (Lib)
messages: 245760
nosy: Zahari.Dim
priority: normal
severity: normal
status: open
title: xontextlib.redirect_stdout should redirect C output
type: enhancement
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue24500>
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