Trinkey Dance Party : fun pulsing colors for NeoTrinkey

trinkey_dance_code.py

# Trinkey dance party
# 2021 @todbot
import time
import board
import neopixel
import random
leds = neopixel.NeoPixel(board.NEOPIXEL, 4, brightness=0.3, auto_write=False)
bpm = 130
ms_per_beat = int(60e3 / bpm / 16)
i=0
while True:
    leds[0:] = [[max(i-8,0) for i in l] for l in leds] # fadeToBlackBy(8)
    leds.show()
    i = (i+1) % ms_per_beat
    if i==0:
        leds[0:] = [int(random.random() * 2**24) for l in leds] # each LED gets new random color
    time.sleep(0.01)  

Awesome, let me know if you have any other questions.
If you're just getting started, the above is using a Python trick called "list comprehensions" to do things in one line.
So for instance this line:

    leds[0:] = [rainbowio.colorwheel(random.random()*255) for l in leds]

is the same as:

    for i in range(len(leds)):
      leds[i] = rainbowio.colorwheel(random.random()*255)