如何将数学公式从函数写入文件？

Question

我试着从一个文件统计，并计算平均值，中位数，最小值和最大值。 我已经做了这么多了。你知道吗

我需要给用户一个选项，将计算出的统计数据保存到一个新文件中。它给了我一个错误，说“str”对象没有属性“write”

有人知道我如何将“computed\u stats”函数写入文件吗？ 我真的很感激任何帮助！你知道吗

这是我大部分代码的屏幕截图。我没有足够的屏幕空间来包含提示用户输入选择的表或加载数据的函数。他们在这个问题上似乎并不重要。你知道吗

def table():
    print("Choose an option:")
    print("1. Load data")
    print("2. Display computed statistics")
    print("3. Save computed statistics")
    print("4. Exit")

def load_data(filename):
    with open(filename) as f:
        for lines in f:
            numbers = lines.split()
            return(numbers)

def compute_stats(data_list):

    minimum = (min(data_list))
    maximum = (max(data_list))
    mean = (sum(data_list) / (len(data_list)))
    data = sorted(data_list)
    if (len(data) % 2) == 1:
        median = data[len(data) // 2]      
    else:
        median = (data[len(data) // 2] + data[len(data) // 2 - 1]) / 2
    return minimum, maximum, mean, median

def print_stats(data_list):
    minumum, maximum, mean, median = compute_stats(data_list)
    print(minimum)
    print(maximum)
    print(mean)
    print(median)


def save_stats(new_file):
    global comp_data    
    with open(new_file, 'w') as f:        
        f.close()



def main():


    selection = 0
    while selection != "4":
        table()
        selection = input("Choose a selection: ")
        print()

        if selection == "1":
            data_list = input("Enter the name of your file: ")
            data_list = load_data(data_list)
            data_list = [int(x) for x in data_list]
            print("Data read sucessfully \n")


        elif selection == "2":          
            print_stats(data_list)


        elif selection == "3":
            new_file = input("Enter File Name")
            save_stats(new_file)


main()

Answer 1

你们在这里遇到的一个经典问题是，你们把结果的表示和计算搞混了。在您的代码中，computed_stats函数同时执行打印和计算。顺便说一句，它的名字不好，像print_statistics这样的名字可能更好。通常，当函数名不是自然地以动词开头时，它们的职责定义得很糟糕。你知道吗

对于第一个改变，我会这样做：

def compute_statistics(data_list):
    # Do whatever computations you need but don't print anything
    minimum = #Insert computation for minimum here
    maximum = #Insert computation for maximum here
    mean = #Insert computation for mean here
    median = #Insert computation for median here
    return minimum, maximum, mean, median # whatever statistics you are computing

def print_statistics(data_list):
    minimum, maximum, mean, median=compute_statistics(data_list)
    # Put your printing logic here using the results from above

def save_statistics(file_name, data_list):
    minimum, maximum, mean, median=compute_statistics(data_list)
    with open(file_name,'w') as outfile:
        file.write(f"min = {minimum}\n")
        # Put all your saving logic here

如果希望打印的版本与保存的版本完全相同，还可以添加一个函数来生成该字符串，您可以从print_statistics和save_statistics调用该函数。你知道吗

稍后，您可能希望考虑如何更好地管理应用程序的状态，这样就不必每次都重新计算统计信息。但这是另一个时代的故事。你知道吗