Python算术练习程序break/continue报错，如何根据用户输入重启程序？

核心问题说明 #

你的代码存在三个导致报错和功能异常的问题：

• 循环控制语句位置错误：break和continue只能在循环体内部使用，你当前把重试判断逻辑放在了while True的缩进范围外，运行会直接触发语法错误。
• 随机数生成位置错误：a、b的随机生成逻辑放在了循环外，就算循环能正常运行，每次生成的题目都是完全相同的，不会更新新的数值。
• 变量未定义风险：a < b、a == b的分支内没有单独获取用户输入的answer变量，若运行时优先触发这两个分支，会直接报变量未定义错误。

修复后可运行代码 #

import random

goodQuotes = ["Nice job", "Keep going", "Excellent", "Great job", "You are doing great"]
badQuotes = ["You got that wrong", "Unfortunately that is incorrect", "Try again", "Retry this problem", "You made a mistake"]

while True:
    # 每次循环生成新的随机题目
    a = random.randint(0, 1000)
    b = random.randint(0, 1000)
    
    if a > b:
        print(f'What is {a} - {b}')
        answer = int(input("Enter your answer: "))
        if answer == a - b:
            print(random.choice(goodQuotes))
        else:
            print(random.choice(badQuotes))
    elif a < b:
        print(f'What is {a} + {b}')
        answer = int(input("Enter your answer: "))
        if answer == a + b:
            print(random.choice(goodQuotes))
        else:
            print(random.choice(badQuotes))
    else:
        print(f'What is {a} * {b}')
        answer = int(input("Enter your answer: "))
        if answer == a * b:
            print(random.choice(goodQuotes))
        else:
            print(random.choice(badQuotes))
    
    # 重试逻辑放在循环内部
    retry = input("Want to try another problem, enter yes or no: ").strip().lower()
    if 'yes' in retry:
        continue
    elif 'no' in retry:
        print("Good Bye")
        break
    else:
        print("Invalid Input, exit program.")
        break

内容的提问来源于stack exchange，提问作者Vishnu Menon