Randomization constraints

Coding
2

Hi @thewall79, found this on stack overflow (see link below):

import random
while 1:
    choices = [1, 2, 3] * 1000

    shuffle = []

    last = ""

    while choices:
        l = choices
        if last:
            l = [x for x in l if x != last]
        if not l:
            #no valid solution
            break 
        newEl = random.choice(l)
        last = newEl
        shuffle.append(newEl)
        choices.remove(newEl)
    if not choices:
        print(shuffle)
        break

Adapted from https://stackoverflow.com/a/35784338