Disable output buffering

From Magnus Lycka answer on a mailing list:

You can skip buffering for a whole python process using "python -u" (or#!/usr/bin/env python -u etc) or by setting the environment variable PYTHONUNBUFFERED.

You could also replace sys.stdout with some other stream like wrapper which does a flush after every call.

classUnbuffered(object):def __init__(self, stream):
       self.stream = stream
   def write(self, data):
       self.stream.write(data)
       self.stream.flush()def __getattr__(self, attr):return getattr(self.stream, attr)import sys
sys.stdout =Unbuffered(sys.stdout)print'Hello'