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MIDI Objects for Python

Project description

Mido is a library for working with MIDI messages and ports:

>>> import mido
>>> msg = mido.Message('note_on', note=60)
>>> msg.type
>>> msg.note
>>> msg.bytes()
[144, 60, 64]
>>> msg.copy(channel=2)
Message('note_on', channel=2, note=60, velocity=64, time=0)
port = mido.open_output('Port Name')
with mido.open_input() as inport:
    for msg in inport:
mid = mido.MidiFile('song.mid')
for msg in

Full documentation at

Main Features

  • works in Python 2 and 3.

  • convenient message objects.

  • supports RtMidi, PortMidi and Pygame. New backends are easy to write.

  • full support for all 18 messages defined by the MIDI standard.

  • standard port API allows all kinds of input and output ports to be used interchangeably. New port types can be written by subclassing and overriding a few methods.

  • includes a reusable MIDI stream parser.

  • full support for MIDI files (read, write, create and play) with complete access to every message in the file, including all common meta messages.

  • can read and write SYX files (binary and plain text).

  • implements (somewhat experimental) MIDI over TCP/IP with socket ports. This allows for example wireless MIDI between two computers.

  • includes programs for playing MIDI files, listing ports and serving and forwarding ports over a network.


1.2 is the third stable release.


Mido targets Python 3.6 and 2.7.


pip install mido

If you want to use ports:

pip install python-rtmidi

See docs/backends/ for other backends.

Source Code


Mido is released under the terms of the MIT license.

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