import os
import random

delim = "\\"
ready = False
randompath = "C:"+delim;

while ready != True:
pathlist = [randompath+path+delim for path in [lpath for lpath in os.listdir(randompath)] if os.path.isdir(randompath+path)]

if pathlist == [] or random.randint(1,10) == 1:
ready = True
else ...