程式碼：

def shengxiao(year):
    zodiac=["鼠","牛","虎","兔","龍","蛇","馬","羊","猴","雞","狗","豬"]
    i= (year-1900)%12
    j=zodiac[i]
    return j

myyear=int(input("Please enter your year until enter 0:"))
while myyear!=0:
    print("Your zodiac is:",shengxiao(myyear) )
    myyear=int(input("Please enter your year until enter 0:"))

效果：

Please enter your year until enter 0:1984
Your zodiac is: 鼠
Please enter your year until enter 0:1992
Your zodiac is: 猴
Please enter your year until enter 0:1983
Your zodiac is: 豬
Please enter your year until enter 0:1981
Your zodiac is: 雞
Please enter your year until enter 0:1999
Your zodiac is: 兔
Please enter your year until enter 0:1996
Your zodiac is: 鼠
Please enter your year until enter 0:2008
Your zodiac is: 鼠
Please enter your year until enter 0:0

總結：

1. 列表有X元素，就取X的模，這樣X[0]，對應第一個元素，X[X-1]對應第X個元素；
2. 這裡的迴圈條件，myyear!=0，一直呼叫函式，一直輸出提示語，直到輸入0結束，可以改編成隨機點名。