# Under Windows (tested XP-32):
#
# If this script is piped, e.g.:
#
# python stdout.py > somefile
# or
# python stdout.py | cat
#
# .. then any multiprocessing.Process children's stdout will not appear. Trying
# to flush() stdout from the child process will produce an IOError.

from multiprocessing import Process
from sys import stdout, stderr

def child():
    print >> stderr, "[Child] stdout:", stdout
    print "[Child] message via stdout"
    stdout.flush()
        
if __name__ == '__main__':
    print >> stderr, "[Parent] stdout:", stdout
    print "[Parent] message via stdout\n"
    stdout.flush()
    p = Process(target = child)
    p.start()
    p.join()