import ctypes

mciExecute = ctypes.windll.winmm.mciExecute
mciExecute.argTypes = [ctypes.c_char_p]

def play_midi(filename):
    assert mciExecute("open sequencer!%s alias midifile wait" % filename)
    assert mciExecute("play midifile wait")
    assert mciExecute("close midifile wait")

if __name__ == '__main__':
    import sys
    play_midi(sys.argv[1])