Blinks lights on a Launchpad Mini

blinker.py

from subprocess import call
from time import sleep
from random import randint

device_name = "hw:1"

loop_through = [
    00, 01, 02, 03, 04, 05, 06, 07,
    10, 11, 12, 13, 14, 15, 16, 17,
    20, 21, 22, 23, 24, 25, 26, 27,
    30, 31, 32, 33, 34, 35, 36, 37,
    40, 41, 42, 43, 44, 45, 46, 47,
    50, 51, 52, 53, 54, 55, 56, 57,
    60, 61, 62, 63, 64, 65, 66, 67,
    70, 71, 72, 73, 74, 75, 76, 77
]

colors = [
    "0F", "3F", "3E", "3C"
]

while True:
    for slot in loop_through:
        color = colors[randint(0,3)]
        call(["amidi", "-p", device_name, "-S", "90 " + str(slot) + " " + color])
        sleep(0.02)
        call(["amidi", "-p", device_name, "-S", "90 " + str(slot) + " 0C"])