Python生成4位随机验证码

#随机生成4位验证码
import random
for i in range(20):
    s = ''
    for j in range(4):
        if random.randint(0, 1) == 0:
            s += str(random.randint(0, 9))
        else:
            s += chr(random.randint(65, 90))
    print(s)