从2到21随机取几个数字，但不要取5，6，7，如何操作？

import random
l = [2,3,4,8,9,10,11,12,13,14,15,16,17,18,19,20,21]
print([l[random.randint(0, 16)] for _ in range(5)])

随机取样

import random

result=random.sample([2,3,4,8,9,10,11,12,13,14,15,16,17,18,19,20,21], 3)
print(result)