Print all output ports

import rtmidi_python as rtmidi

midi_out = rtmidi.MidiOut()
for port_name in midi_out.ports:
    print port_name

Send messages

import rtmidi_python as rtmidi

midi_out = rtmidi.MidiOut()
midi_out.open_port(0)

midi_out.send_message([0x90, 48, 100]) # Note on
midi_out.send_message([0x80, 48, 100]) # Note off

Get incoming messages by polling

import rtmidi_python as rtmidi

midi_in = rtmidi.MidiIn()
midi_in.open_port(0)

while True:
    message, delta_time = midi_in.get_message()
    if message:
        print message, delta_time

Note that the signature of get_message() differs from the original RtMidi API: It returns a tuple instead of using a return parameter.

Get incoming messages using a callback

import rtmidi_python as rtmidi

def callback(message, time_stamp):
    print message, time_stamp

midi_in = rtmidi.MidiIn()
midi_in.callback = callback
midi_in.open_port(0)

# do something else here (but don't quit)

Note that the signature of the callback differs from the original RtMidi API: message is now the first parameter, like in the tuple returned by get_message().