import mido
import random

def generate_notes(notes_len):
    notes = []
    for i in range(notes_len):
        notes.append(random.randint(0, 127))

    return notes



def create_midi_file(notes):
    output_midi = mido.MidiFile()
    # create a track 
    track = mido.MidiTrack()
    # add track
    output_midi.tracks.append(track)

    # write notes
    for note in notes:
        track.append(mido.Message('note_on', note = note, velocity=64, time = 120))
        track.append(mido.Message('note_off', note = note, velocity=64, time = 120))

    # write midi file
    output_midi.save('out.mid')

notes = generate_notes(100)
create_midi_file(notes)