import sys, pygame, pygame.midi

# set up pygame
pygame.init()
pygame.midi.init()

# list all midi devices
for x in range( 0, pygame.midi.get_count() ):
    print pygame.midi.get_device_info(x)

# open a specific midi device
inp = pygame.midi.Input(3)

# run the event loop
while True:
    if inp.poll():
        # no way to find number of messages in queue
        # so we just specify a high max value
        mdatain = inp.read(1000)[0][0]
        if mdatain[0] <> 248:
            print mdatain

    # wait 10ms - this is arbitrary, but wait(0) still resulted
    # in 100% cpu utilization
    pygame.time.wait(10)