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在Python数组中使用max()和min()失败

min max sorting python

William · 技术社区 · 8 年前

上下文 :继续自学Python,我最近完成了一个教科书上的练习,要求使用一个程序,允许用户定义“x”年数,并能够在“x”中每个月输入降雨量值。

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

披露:我一直在关注S.O,试图找到我的问题的解决方案,但似乎没有什么能接近我的挑战,来帮助我。

我试过的: 我试过使用 max() 和 min() 然而,我一直得到一个 TypeError: 'int' object is not iterable 当我键入代码时 print(max(monthlyRainfall) 或 print(min(monthlyRainfall)

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()

有没有人能提供一些“指点”来说明我哪里做错了?

2 回复 | 直到 8 年前

Sash Sinha 8 年前

您可以使用 sys.maxsize 和 0 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该值的值。

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))

试用带有上述更改的完整程序 here.

示例用法:

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

N、 B。 我只使用了 camelCase 在命名新变量时,这是您正在使用的样式。我建议将程序中所有变量的名称更改为 snake_case 这是python中的惯例。

Bahriddin Abdiev 8 年前

Python的内置min()和max()函数期望类似iterable的对象 列表,集合 等等。我认为你只放了一个不太正确的整数(当只有一个数字时,你怎么能选择最小值或最大值-显然它是bot min和max)。

声明列表变量:

rainfallList = []
然后,当您获得monthlyRainfall时,您应该添加以下代码:

rainfallList.append(monthlyRainfall)
毕竟,对于可以使用的循环 最小值(rainfallList) 和/或 最大值(rainfallList)

因此,您的最终代码应该是:

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

def calculationAlgorithm(userYearsTracking):
    totalMonths = 0
    totalRainfall = 0

    rainfallList = []

    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
            rainfallList.append(monthlyRainfall)

            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("Min rain:", format(min(rainfallList)), "(inch)")
    print("Max rain:", format(max(rainfallList)), "(inch)")

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