为何满足条件时代码最后一行仍无法执行？来自《Automate The Boring Stuff》

当猜对数字时，代码执行了else: break分支，直接跳出for循环。循环体中break之后的所有代码（包括你写的判断猜对的if语句）都不会被执行，所以祝贺语句永远无法显示。

方案一：将祝贺语句移到猜对的分支内 #

直接在猜对时先打印祝贺信息，再跳出循环，确保信息能被输出：

import random
secret_number = random.randint(1, 20)
print("I'm thinking of a number between 1 and 20")

for guesses_taken in range(1, 7):
    guess = int(input("Take a guess: "))

    if guess < secret_number:
        print("This number is too low")
    elif guess > secret_number:
        print("This number is too high")
    else:
        print(f"Good job! You guessed my number in {guesses_taken} guesses!")
        break

if guesses_taken == 6:
    print(f"Nope, the number I was thinking about was {secret_number}")

方案二：用标记变量统一处理结果 #

通过变量记录是否猜对，循环结束后再输出对应信息，结构更清晰：

import random
secret_number = random.randint(1, 20)
print("I'm thinking of a number between 1 and 20")

guessed_correctly = False
for guesses_taken in range(1, 7):
    guess = int(input("Take a guess: "))

    if guess < secret_number:
        print("This number is too low")
    elif guess > secret_number:
        print("This number is too high")
    else:
        guessed_correctly = True
        break

if guessed_correctly:
    print(f"Good job! You guessed my number in {guesses_taken} guesses!")
else:
    print(f"Nope, the number I was thinking about was {secret_number}")

内容的提问来源于stack exchange，提问作者Nuela