疯狂的一分钟 - 如何在达到时间限制时使循环退出？

Question

这段代码运行得不错……如果我把它完成了，但如果没完成就不行。我需要这个循环在时间到的时候就停止，就像标准考试一样，即使我还没答完所有题目。

The Mad Minute
[A] Randomly generate a bunch of different math questions
[B] User cannot continue a question until the correct answer has been made
[C] User have 60 seconds to solve 10 math problems
[D] Add 1 second to the final time for every wrong answer


import random
import time

OPERATORS = ["+", "-", "*"]
MIN_OPERAND = 3
MAX_OPERAND = 9
TOTAL_PROBLEMS = 5

def generateProblem():
    left = random.randint(MIN_OPERAND, MAX_OPERAND)
    right = random.randint(MIN_OPERAND, MAX_OPERAND)
    operator = random.choice(OPERATORS)

    expression = f"{left} {operator} {right}"
    answer = eval(expression)
    return expression, answer

incorrectAnswer = 0
input("Press enter to start!")
print("---------------------")

startTime = time.time()
loop = 0


while time.time() - startTime < 60 and loop < TOTAL_PROBLEMS:
for i in range(TOTAL_PROBLEMS):
        expression, answer = generateProblem()
        while True:
            userInput = input("Problem #" + str(i + 1) + ": " + expression + " = ")
            if userInput == str(answer):
               loop += 1
               break
            incorrectAnswer += 1
print("Time's up!")
# Add any incorrect answer penalization to the total time
endTime = time.time()
totalTime = endTime - startTime
totalTime = "{:.2f}".format(totalTime)

finalTime = float(totalTime) + incorrectAnswer
print("---------------------")

print("You completed The Mad Minute in", totalTime, "seconds with", incorrectAnswer, "incorrect answers! Your final time is", finalTime)

我暂时把题目设置为5道，时间设置为5秒，因为为了测试30道题在60秒内回答实在太麻烦了。我把计时器也设置为5秒，以确保如果我在第一道题上呆太久，循环会停止，但实际上什么都没发生。我加了一个循环变量，希望它能在while循环中满足条件退出，但感觉是因为我回答得太慢被踢出了。

Answer 1

如果你不小心，你的循环可能会一直进行下去。把第一个while语句去掉，改成下面这个，这样每个问题只允许回答错误5次，而且在处理循环的过程中也会检查时间，而不是在外面检查。

for i in range(TOTAL_PROBLEMS):
    expression, answer = generateProblem()
    incorrectAnswer = 0 # reset this for each question
    while True:
        userInput = input("Problem #" + str(i + 1) + ": " + expression + " = ")
        if userInput == str(answer):
            break
        incorrectAnswer += 1
        if incorrectAnswer > 5: # avoid infinite loop
            print("Too many failed attempts ...")
            break;
    if time.time() - startTime >= 60: # check the elapsed time here
        print("Time's up!")
        break;