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copied!<p>Following the two answers above, I accidentally bumped into the answer. os.pipe() does the job. Thank you for your answers.</p> <p>I'm posting the complete code in case someone else is looking for this:</p> <pre><code>import subprocess from threading import Thread import time import sys import logging import tempfile import os import game_playing_module class Pusher(Thread): def __init__(self, source, dest, proc, name): Thread.__init__(self) self.source = source self.dest = dest self.name = name self.proc = proc def run(self): while (self.proc.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() def get_reader_writer(): fd_read, fd_write = os.pipe() return os.fdopen(fd_read, 'r'), os.fdopen(fd_write, 'w') def connect(exe): logging.basicConfig(level=logging.DEBUG,\ format='%(message)s',\ filename=LOG_FILE_NAME, filemode='w') program_to_grader_reader, program_to_grader_writer =\ get_reader_writer() grader_to_program_reader, grader_to_program_writer =\ get_reader_writer() p1 = subprocess.Popen(exe, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE) old_stdin = sys.stdin old_stdout = sys.stdout sys.stdin = program_to_grader_reader sys.stdout = grader_to_program_writer push1 = Pusher(p1.stdout, program_to_grader_writer, p1, '1') push2 = Pusher(grader_to_program_reader, p1.stdin, p1, '2') push1.start() push2.start() game_playing_module.play() sys.stdin = old_stdin sys.stdout = old_stdout fil = file(LOG_FILE, 'r') data = fil.read() fil.close() return data if __name__=='__main__': if len(sys.argv) != 2: print 'Usage: connect.py exe' print sys.argv exit() print sys.argv print connect(sys.argv[1]) </code></pre>

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