from gpiozero import LED
from time import sleep
import random
yel = LED(17)
green = LED(27)

while True:
    randNum1 = random.choice([True, False])
    randNum2 = random.choice([True, False])

    #print("Num 1")
    #print(randNum1)
    #print("Num 2")
    #print(randNum2)
    print()     #added to slow things down a bit.
    sleep(0.05)
    if randNum1 == True:
        yel.on()
        randNum2 = random.choice([True, False])
        if randNum2 == True:
            green.on()
        else:
            green.off()
    else:
        yel.off()