python - Disable output buffering -

is output buffering enabled default in python's interpreter sys.stdout?

if answer positive, ways disable it?

suggestions far:

1. use -u command line switch
2. wrap sys.stdout in object flushes after every write
3. set pythonunbuffered env var
4. sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

is there other way set global flag in sys/sys.stdout programmatically during execution?

from magnus lycka answer on mailing list:

you can skip buffering whole python process using "python -u" (or#!/usr/bin/env python -u etc) or setting environment variable pythonunbuffered.

you replace sys.stdout other stream wrapper flush after every call.

class unbuffered(object):    def __init__(self, stream):        self.stream = stream    def write(self, data):        self.stream.write(data)        self.stream.flush()    def writelines(self, datas):        self.stream.writelines(datas)        self.stream.flush()    def __getattr__(self, attr):        return getattr(self.stream, attr)  import sys sys.stdout = unbuffered(sys.stdout) print 'hello'