For the Pihut christmas tree...

christmas2.py

from gpiozero import LEDBoard
from time import sleep
from signal import pause
treelights=[ 18, 5, 9, 11, 21, 10, 7, 12, 6, 1,14, 3, 20, 24, 13, 15,2, 17, 16, 23,8, 22, 4, 19 ]
treemap={ 1:4, 7:5, 16:6, 22:7, 6:8 , 14:9, 8:10, 21:11, 15:12, 3:13, 19:14, 2:15, 9:16, 10:17, 20:18, 18:19,17:20, 4:21, 24:22, 23:23, 13:
24, 5:25, 12:26, 11:27
}

leds=LEDBoard(*range(4,28), pwm=True)

def labelToPin(l):
        return treemap[l]

def toBoard(l):
    return labelToPin(l)-4

while True:
    for i in treelights:
        sleep(0.1)
        leds.on(toBoard(i))

    for i in treelights:
        sleep(0.1)
        leds.off(toBoard(i))

I see no big difference to the original snippet.

Do you have more codes for this tree?