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【Python 学习】通过while循环和for循环猜测年龄

2019-03-01 10:13:39来源：博客园阅读 ()

Python中可以通过while和for循环来限制猜测年龄的次数

1. 在猜测年龄的小程序中，不加循环的代码是这样的：

age_of_yu = 23

guess_age = int(input("guess_age:"))
if guess_age == age_of_yu:
    print("you got it!")
elif guess_age > age_of_yu:
    print("think smaller...")
else:
    print("think bigger...")

# 这里的 int(input("guess_age:")) 是将变量定义的默认数据类型（str）强制转换成 int 类型，从而可以进行 if 的条件比较

2. 通过for循环限制猜测年龄的次数为3次

age_of_yu = 23

for i in range(3):
    guess_age = int(input("guess_age:"))
    if guess_age == age_of_yu:
        print("you got it!")
        break
    elif guess_age > age_of_yu:
        print("think smaller...")
    else:
        print("think bigger...")

else:
    print("you have tried too many times!")

3. 通过 while 循环限制猜测年龄的次数为3次

age_of_yu = 23

count = 0
while count < 3:
    guess_age = int(input("guess_age:"))
    if guess_age == age_of_yu:
        print("you got it!")
        break
    elif guess_age > age_of_yu:
        print("think smaller...")
    else:
        print("think bigger...")
    count += 1

else:
    print("you have tried too many times!")

4. 猜测年龄，要求猜到三次询问是否还要继续猜测，如果输入"n"则表示继续猜，否则表示不继续

age_of_yu = 23

count = 0
while count < 3:
    guess_age = int(input("guess_age:"))
    if guess_age == age_of_yu:
        print("you got it!")
        break
    elif guess_age > age_of_yu:
        print("think smaller...")
    else:
        print("think bigger...")
    count += 1
    if count == 3:
        continue_guess = input("Do you want to go on guessing ?(输入n结束，输入其他任意键继续...)")
        if continue_guess != 'n':
            count = 0
        else:
            print("guessing end...")