python猜数字游戏

from random import randint
num = randint(1, 100)
bingo = False
print('Guess what i think?')
while bingo == False:
    answer = int(input())
    if answer < num:
        print('too small!')
    if answer > num:
        print('too big!')
    if answer == num:
        print('bingo!')
        bingo = True