Hello.

Short version (if you can answer the short version it does the job for me, the rest is mainly for the benefit of other people with a similar task):

In python in Windows, I want to create 2 file objects, attached to the same file (it doesn't have to be an actual file on the hard-drive), one for reading and one for writing, such that if the reading end tries to read it will never get EOF (it will just block until something is written). I think in linux os.mkfifo() would do the job, but in Windows it doesn't exist. What can be done? (I must use file-objects).

Some extra details: I have a python module (not written by me) that plays a certain game through stdin and stdout (using raw_input() and print). I also have a Windows executable playing the same game, through stdin and stdout as well. I want to make them play one against the other, and log all their communication.

Here's the code I can write (the get_fifo() function is not implemented, because that's what I don't know to do it Windows):

class Pusher(Thread):
        def __init__(self, source, dest, p1, name):
                Thread.__init__(self)
                self.source = source
                self.dest = dest
                self.name = name
                self.p1 = p1

        def run(self):
                while (self.p1.poll()==None) and\
                      (not self.source.closed) and (not self.source.closed):
                        line = self.source.readline()
                        logging.info('%s: %s' % (self.name, line[:-1]))
                        self.dest.write(line)
                        self.dest.flush()


exe_to_pythonmodule_reader, exe_to_pythonmodule_writer =\
                          get_fifo()
pythonmodule_to_exe_reader, pythonmodule_to_exe_writer =\
                          get_fifo()

p1 = subprocess.Popen(exe, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE)

old_stdin = sys.stdin
old_stdout = sys.stdout

sys.stdin = exe_to_pythonmodule_reader
sys.stdout = pythonmodule_to_exe_writer

push1 = Pusher(p1.stdout, exe_to_pythonmodule_writer, p1, '1')
push2 = Pusher(pythonmodule_to_exe_reader, p1.stdin, p1, '2')

push1.start()
push2.start()
ret = pythonmodule.play()
sys.stdin = old_stdin
sys.stdout = old_stdout