Python Silencer (Context Manager)
For when you need to keep some code quiet.
class Silencer(object):
""" Creates a silent context. All output to the given file-like
objects is instead sent to /dev/null.
"""
def __init__(self, *files):
self._files = files
def __enter__(self):
self._dupes = {x.fileno(): os.dup(x.fileno()) for x in self._files}
null = open(os.devnull, 'ab')
for x in self._files:
x.flush()
os.dup2(null.fileno(), x.fileno())
null.close()
def __exit__(self, *args):
for x in self._files:
x.flush()
os.dup2(self._dupes[x.fileno()], x.fileno())
os.close(self._dupes[x.fileno()])You can use it like this:
with Silencer(sys.stdout, sys.stderr):
print 'I will not be seen.'
sys.stdout.write('me neither')
sys.stderr.write('me three')Written by Matt Sirocki
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