python生成随机验证码

import random

i = random.randrange(65,91)
print(i)
temp = ""
for i in range(6):
num = random.randrange(0, 4)
if num == 3 or num == 1:
rad2 = random.randrange(0, 10)
temp = temp + str(rad2)
else:
rad = random.randrange(65, 91)
c = chr(rad)
temp = temp + c
print(temp)