6位數（字母和數字）驗證碼

import random
item = ''
for i in range(6):
    num1 = random.randint(0,9)
    if num1 < 5:
        num =str(random.randint(0,9))
        item += num
    else:
        zm = random.randint(65,91)
        zm = chr(zm)
        item += zm
#chr()將數字變成對應的字母  ord()將字母變成對應的數字
print(item)