python - 在 Python 数组中使用 max() 和 min() 失败

Question

上下文:继续自学 Python，我最近完成了一个教科书练习，要求一个程序允许用户定义“x”年数并能够输入，对于“x”中的每个月，降雨量值。

问题:下面是我的代码，工作正常，但是最新的练习要求我“扩展”我的代码，以在打印语句中显示数字上最大和最小的用户输入降雨值.

披露:我曾向 S.O 寻求尝试找到我的问题的解决方案，但似乎没有任何东西足以接近我的挑战，来帮助我。

我尝试过的:我尝试过使用 max() 和 min() 但我不断收到 TypeError :当我键入代码 print(max(monthlyRainfall) 或 print(min(monthlyRainfall)

时，“int”对象不可迭代

def yearsToTrack():
    userYearsTracking = int(input("How many years do you want to track: "))
    return userYearsTracking

def calculationAlgorithm(userYearsTracking):
    totalMonths = 0
    totalRainfall = 0
    for currentYear in range (1, userYearsTracking +1):
        for currentMonth in range (1, 13):
            monthlyRainfall = int(input("Inches of rainfall for month " + format(currentMonth, "d",) + " | year " +
                                    format(currentYear, "d",)+": "))
            totalMonths += 1
            totalRainfall += monthlyRainfall
    averageRainfall = totalRainfall / totalMonths
    print("Total months: " + str(totalMonths))
    print("Total rain:", format(totalRainfall), "(inch)")
    print("Total average rainfall:", round(averageRainfall,2), "(inch)")

def main():
    userYearsTracking = yearsToTrack()
    calculationAlgorithm(userYearsTracking)
main()

有人可以提供一些关于我哪里出错的“指示”吗？

Answer 1

您可以使用sys.maxsize和 0 来初始化用于跟踪最小和最大降雨量值的变量，实际上用户永远不会分别输入高于或低于这些值。

但是，对于第二种情况，只是为了确保您还可以添加一个简单的检查，以确保用户不会输入负降雨量:

def calculationAlgorithm(userYearsTracking):
    totalMonths = 0
    totalRainfall = 0
    maxRainfall = 0
    minRainfall = sys.maxsize
    for currentYear in range (1, userYearsTracking +1):
        for currentMonth in range (1, 13):
            monthlyRainfall = int(input("Inches of rainfall for month " + format(currentMonth, "d",) + " | year " +
                                    format(currentYear, "d",)+": "))
            if monthlyRainfall < 0:
                print("Error invalid rainfall entered")
                sys.exit()
            if monthlyRainfall > maxRainfall:
                maxRainfall = monthlyRainfall
            if monthlyRainfall < minRainfall:
                minRainfall = monthlyRainfall
            totalMonths += 1
            totalRainfall += monthlyRainfall
    averageRainfall = totalRainfall / totalMonths
    print("Total months: " + str(totalMonths))
    print("Total rain:", format(totalRainfall), "(inch)")
    print("Total average rainfall:", round(averageRainfall,2), "(inch)")
    print("Largest input rainfall: " + str(maxRainfall))
    print("Smallest input rainfall: " + str(minRainfall))

尝试进行上述更改的完整程序 here.

用法示例:

How many years do you want to track:  1
Inches of rainfall for month 1 | year 1:  2
Inches of rainfall for month 2 | year 1:  2
Inches of rainfall for month 3 | year 1:  2
Inches of rainfall for month 4 | year 1:  2
Inches of rainfall for month 5 | year 1:  4
Inches of rainfall for month 6 | year 1:  1
Inches of rainfall for month 7 | year 1:  2
Inches of rainfall for month 8 | year 1:  2
Inches of rainfall for month 9 | year 1:  2
Inches of rainfall for month 10 | year 1:  2
Inches of rainfall for month 11 | year 1:  2
Inches of rainfall for month 12 | year 1:  2
Total months: 12
Total rain: 25 (inch)
Total average rainfall: 2.08 (inch)
Largest input rainfall: 4
Smallest input rainfall: 1

注意我只使用过camelCase 命名新变量，因为这是您正在使用的样式。我建议将程序中的所有变量名称更改为 snake_case因为这是 python 中的约定。