Python程式設計快速上手——讓繁瑣工作自動化，第三章實踐題答案（新手寫的，望大家修改指正。）

3.11.1 Collatz 序列

def collatz(number):
    if number % 2 == 0:
        even = number // 2
        print(even)
        return even
    elif number % 2 == 1:
        uneven = 3*number + 1
        print(uneven)
        return uneven
integer = int(input("Please enter a integer:"))
while True:
    integer = collatz(integer)
    if integer == 1:
        break
 

3.11.2 輸入驗證

def collatz(number):
    if number % 2 == 0 and number != 0:
        even = number // 2
        print(even)
        return even
    elif number % 2 == 1:
        uneven = 3*number + 1
        print(uneven)
        return uneven

while True:
    integer = input("Please enter a integer:")
    try:
        integer = int(integer)
        while True:
            integer = collatz(integer)
            if integer == 1:
                break
        break
    except ValueError:
        print("請輸入一個整數")
    except TypeError:
        print("輸入不能是0")
 

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