python - While 循环的平均时间

Question

我有一个函数可以测量某人回答乘法和所需的时间，但我希望能够显示用户完成使用该函数后所花费的平均时间（它在一个 while 循环中）。这是功能：

def withTimer():
    playAgain = "yes"
    correct = 0
    total = 0
    while playAgain == "yes":
        total = total + 1
        random1 = random.choice(tablesUsed)
        random2 = random.randint(1, 12)
        realAnswer = random1 * random2
        start = time.time()
        humanAnswer = int(input("What is the answer to this multiplication sum?\n" + str(random1) + " * " + str(random2) + "\n"))
        if realAnswer == humanAnswer:
            elapsed = round((time.time() - start), 1)
            correct = correct + 1
            score = str(int(correct / total * 100)) + "%"
            if elapsed < 2:
                print("Congratulations, you got it correct in " + str(elapsed) + " seconds!\nThat is a very good time!\nScore: " + score)
            else:
                print("Congratulations, you got it correct in " + str(elapsed) + " seconds!\nNow work on your time.\nScore: " + score)            
        else:
            score = str(int(correct / total * 100)) + "%"
            print("Unforunately, you got this one incorrect, the actual answer was " + str(realAnswer) + ".\nScore: " + score)
        elapsed1 = 
        playAgain = input("Do you wish to play again? (yes or no)\n")
        if playAgain == "yes":
            settings()
        else:
            print("Thank you for practicing your multiplication tables\nwith me\nFinal Score: " + score + "\nAverage Time: " + averageTime)

我已经编写了 averageTime 变量来显示我想要显示的平均时间。
我试过这个：

if realAnswer == humanAnswer:
            elapsed = round((time.time() - start), 1)
            times = times.append(elapsed)

我在哪里定义了变量times = []，并且global times在另一个函数中，但这会产生错误：

'NoneType' object has no attribute 'append', line 26

请帮助我尝试了解发生了什么，以及解决方案！
提前致谢。

Answer 1

您可以创建一个经过时间的列表，然后通过将所有经过的时间相加并除以列表中的项目数来计算平均值，但是您不需要这样做。只要您保持已用时间的总和，平均回答时间就是总用时除以回答总数。

您的程序的以下版本以这两种方式计算平均值并显示两者以表明两种方式的结果相同。

import time,random

def withTimer():
    playAgain = "yes"
    correct = 0
    total = 0
    totalTime = 0
    etime = []
    while playAgain[0] == "y":
        total = total + 1
        random1 = random.randint(1, 12)
        random2 = random.randint(1, 12)
        realAnswer = random1 * random2
        start = time.time()
        humanAnswer = int(input("What is the answer to this multiplication sum?\n" + str(random1) + " * " + str(random2) + "\n"))
        if realAnswer == humanAnswer:
            elapsed = round((time.time() - start), 1)
            etime.append(elapsed)
            correct = correct + 1
            score = str(int(correct / total * 100)) + "%"
            if elapsed < 2:
                print("Congratulations, you got it correct in " + str(elapsed) + " seconds!\nThat is a very good time!\nScore: " + score)
            else:
                print("Congratulations, you got it correct in " + str(elapsed) + " seconds!\nNow work on your time.\nScore: " + score)            
        else:
            score = str(int(correct / total * 100)) + "%"
            print("Unforunately, you got this one incorrect, the actual answer was " + str(realAnswer) + ".\nScore: " + score)
        totalTime += elapsed
        playAgain = input("Do you wish to play again? (yes or no)\n")
    averageTime = totalTime / total
    averageTime1 = sum(etime) / len(etime)
    if playAgain[0] != "y":
        print("Thank you for practicing your multiplication tables\nwith me\nFinal Score: " + score + "\nAverage Time: " + str(averageTime) + " AverageTime1 = "  + str(averageTime))


withTimer()