Python问题：无法访问程序中的选项

Question

当我在菜单中选择选项 4 时，我不断收到 TypeError: Cannot unpack non-iterable int object。我该如何解决这个问题，我已经尝试了几个小时但没有成功。代码如下：

from turtle import right
def selection_sort(altered_number_list, sorting_order):
    if sorting_order == 1:
        for value in range (0, len(altered_number_list)-1):
            least_value = value
            for index in range (value+1, len(altered_number_list)):
                if altered_number_list[index] < altered_number_list[least_value]:
                    altered_number_list[index], altered_number_list[least_value] = altered_number_list[least_value], altered_number_list[index]           
        return altered_number_list
    else: 
        for value in range (0, len(altered_number_list)-1):
            least_value = value
            for index in range (value+1, len(altered_number_list)):
                if altered_number_list[index] > altered_number_list[least_value]:
                    altered_number_list[index], altered_number_list[least_value] = altered_number_list[least_value], altered_number_list[index]
            return altered_number_list
def bubble_sort(altered_number_list, sorting_order):
    if sorting_order == 1:
        for value in range (len(altered_number_list)):
            for index in range (0, len(altered_number_list)-1):
                if altered_number_list[index] > altered_number_list[index+1]:
                    altered_number_list[index], altered_number_list[index+1] = altered_number_list[index+1], altered_number_list[index]
        return altered_number_list
    else: 
        for value in range (len(altered_number_list)):
            for index in range (0, len(altered_number_list)-1):
                if altered_number_list[index] < altered_number_list[index+1]:
                    altered_number_list[index], altered_number_list[index+1] = altered_number_list[index+1], altered_number_list[index]
        return altered_number_list

def insertion_sort(altered_number_list, sorting_order):
    if sorting_order == 1:
        for value in range(1, len(altered_number_list)):
            insert_value = number_list[value]
            data_switch = value
            while data_switch > 0 and altered_number_list[data_switch-1] > insert_value:
                altered_number_list[data_switch] = altered_number_list[data_switch-1]
                data_switch -= 1
            altered_number_list[data_switch] = insert_value
        return altered_number_list
    else: 
        for value in range(1, len(altered_number_list)):
            insert_value = number_list[value]
            data_switch = value
            while data_switch > 0 and altered_number_list[data_switch-1] < insert_value:
                altered_number_list[data_switch] = altered_number_list[data_switch-1]
                data_switch -= 1
            altered_number_list[data_switch] = insert_value
        return altered_number_list

def quick_sort(altered_number_list, number_list_min, number_list_max, sorting_order):
    if number_list_min < number_list_max:
        split_value = partition_sort(altered_number_list, number_list_min, number_list_max, sorting_order)
        quick_sort(altered_number_list, number_list_min, split_value-1, sorting_order)
        quick_sort(altered_number_list, split_value+1, number_list_max, sorting_order)

def partition_sort(alter_number_list, number_list_min, number_list_max, sorting_order):
    if sorting_order == 1:
        pivot_value = alter_number_list[number_list_min]
        left_value = number_list_min + 1
        right_value = number_list_max
        complete = False
        while not complete:
            while left_value <= right_value and alter_number_list[left_value] <= pivot_value:
                left_value = left_value + 1
            while alter_number_list[right_value] >= pivot_value and right_value >= left_value:
                right_value = right_value - 1
            if right_value < left_value:
                complete = True
            else:
                alter_number_list[left_value], alter_number_list[right_value] = alter_number_list[right_value], alter_number_list[left_value]
        alter_number_list[number_list_min], alter_number_list[right_value] = alter_number_list[right_value] = alter_number_list[number_list_min]
        return alter_number_list
    else: 
        pivot_value = alter_number_list[number_list_min]
        left_value = number_list_min + 1
        right_value = number_list_max
        complete = False
        while not complete:
            while left_value <= right_value and alter_number_list[left_value] >= pivot_value:
                left_value = left_value + 1
            while alter_number_list[right_value] <= pivot_value and right_value >= left_value:
                right_value = right_value - 1
            if right_value < left_value:
                complete = True
            else:
                alter_number_list[left_value], alter_number_list[right_value] = alter_number_list[right_value], alter_number_list[left_value]
        alter_number_list[number_list_min], alter_number_list[right_value] = alter_number_list[right_value] = alter_number_list[number_list_min]
        return alter_number_list   

import random
print("This program will sort a list of random numbers using a user determined sorting algorithm.")
sorting_algorithms = ["Selection Sort", "Bubble Sort", "Insertion Sort", "Quick Sort"]
sorting_orders = ["Ascending", "Descending"]
number_list = []
while True:
    try:
        random_numbers = int(input("Input number of random integers generated: "))
        print("Sorting Algorithms: ")
        for sort in range (0, len(sorting_algorithms)):
            print(f"{sort+1} - {sorting_algorithms[sort]}") 
        sorting_algorithm = int(input("Select sorting algorithm: "))
        print("Sorting Orders: ")
        for sort in range (0, len(sorting_orders)):
            print(f"{sort+1} - {sorting_orders[sort]}") 
        sorting_order = int(input("Select sorting algorithm order: "))

        if random_numbers < 1 or random_numbers > 999999:
            print("Invalid input, integer values greater then or equal to one and integer values less then or equal to 999999 are accepted.")
            continue
        elif sorting_algorithm < 1 or sorting_algorithm > 4:
            print("Invalid input, integer values greater then or equal to one and integer values less then or equal to four are accepted.")
            continue
        elif sorting_order < 1 or sorting_order > 2:
            print("Invalid input, integer values greater then or equal to one and integer values less then or equal to two are accepted.")
            continue

        for i in range(random_numbers):
            number_list.append(random.randint(0, 999999))
        print (number_list)
        
        number_list_min = 0
        number_list_max = len(number_list) - 1

        if sorting_algorithm == 1:
            altered_number_list = selection_sort(number_list, sorting_order)
            break
        elif sorting_algorithm == 2:
            altered_number_list = bubble_sort(number_list, sorting_order)
            break
        elif sorting_algorithm == 3:
            altered_number_list = insertion_sort(number_list, sorting_order)
            break
        elif sorting_algorithm == 4:
            altered_number_list = quick_sort(number_list, number_list_min, number_list_max, sorting_order)
            break 
    except:
        print("Invalid input, integer values in the program specified parameters are accepted.")
print(altered_number_list)

在上面的代码中，我可以毫无困难地访问选项 1、2 和 3，但我无法访问第四个选项，因为它显示错误消息。此时，我已尝试重命名变量，使用不同的循环和操作，并创建单独的函数，但我仍然无法访问第四个选项，即快速排序算法。非常感谢任何帮助！

这是快速排序和分区排序的代码：

def quick_sort(altered_number_list, number_list_min, number_list_max, sorting_order):
    if number_list_min < number_list_max:
        split_value = partition_sort(altered_number_list, number_list_min, number_list_max, sorting_order)
        quick_sort(altered_number_list, number_list_min, split_value-1, sorting_order)
        quick_sort(altered_number_list, split_value+1, number_list_max, sorting_order)

def partition_sort(alter_number_list, number_list_min, number_list_max, sorting_order):
    if sorting_order == 1:
        pivot_value = alter_number_list[number_list_min]
        left_value = number_list_min + 1
        right_value = number_list_max
        complete = False
        while not complete:
            while left_value <= right_value and alter_number_list[left_value] <= pivot_value:
                left_value = left_value + 1
            while alter_number_list[right_value] >= pivot_value and right_value >= left_value:
                right_value = right_value - 1
            if right_value < left_value:
                complete = True
            else:
                alter_number_list[left_value], alter_number_list[right_value] = alter_number_list[right_value], alter_number_list[left_value]
        alter_number_list[number_list_min], alter_number_list[right_value] = alter_number_list[right_value] = alter_number_list[number_list_min]
        return alter_number_list
    else: 
        pivot_value = alter_number_list[number_list_min]
        left_value = number_list_min + 1
        right_value = number_list_max
        complete = False
        while not complete:
            while left_value <= right_value and alter_number_list[left_value] >= pivot_value:
                left_value = left_value + 1
            while alter_number_list[right_value] <= pivot_value and right_value >= left_value:
                right_value = right_value - 1
            if right_value < left_value:
                complete = True
            else:
                alter_number_list[left_value], alter_number_list[right_value] = alter_number_list[right_value], alter_number_list[left_value]
        alter_number_list[number_list_min], alter_number_list[right_value] = alter_number_list[right_value] = alter_number_list[number_list_min]
        return alter_number_list   

我认为主要问题在于以下代码：

while True:
    try:
        random_numbers = int(input("Input number of random integers generated: "))
        print("Sorting Algorithms: ")
        for sort in range (0, len(sorting_algorithms)):
            print(f"{sort+1} - {sorting_algorithms[sort]}") 
        sorting_algorithm = int(input("Select sorting algorithm: "))
        print("Sorting Orders: ")
        for sort in range (0, len(sorting_orders)):
            print(f"{sort+1} - {sorting_orders[sort]}") 
        sorting_order = int(input("Select sorting algorithm order: "))

        if random_numbers < 1 or random_numbers > 999999:
            print("Invalid input, integer values greater then or equal to one and integer values less then or equal to 999999 are accepted.")
            continue
        elif sorting_algorithm < 1 or sorting_algorithm > 4:
            print("Invalid input, integer values greater then or equal to one and integer values less then or equal to four are accepted.")
            continue
        elif sorting_order < 1 or sorting_order > 2:
            print("Invalid input, integer values greater then or equal to one and integer values less then or equal to two are accepted.")
            continue

        for i in range(random_numbers):
            number_list.append(random.randint(0, 999999))
        print (number_list)
        
        number_list_min = 0
        number_list_max = len(number_list) - 1

        if sorting_algorithm == 1:
            altered_number_list = selection_sort(number_list, sorting_order)
            break
        elif sorting_algorithm == 2:
            altered_number_list = bubble_sort(number_list, sorting_order)
            break
        elif sorting_algorithm == 3:
            altered_number_list = insertion_sort(number_list, sorting_order)
            break
        elif sorting_algorithm == 4:
            altered_number_list = quick_sort(number_list, number_list_min, number_list_max, sorting_order)
            break 
    except:
        print("Invalid input, integer values in the program specified parameters are accepted.")

Answer 1

错误消息：

TypeError: cannot unpack non-iterable int object

很可能告诉您，在代码中的某个位置，您必须有一行看起来像：

a, b = c

其中 c 是 int，因此不能拆分为a 和 b 就像是一对一样。

您的代码中只有一行看起来像这样，而且确实很可疑：

alter_number_list[number_list_min], alter_number_list[right_value] = alter_number_list[right_value] = alter_number_list[number_list_min]

我相信您的意思是交换两个值，而第二个等号 = 应该是逗号 ,：

alter_number_list[number_list_min], alter_number_list[right_value] = alter_number_list[right_value], alter_number_list[number_list_min]

请注意，python 给出的完整错误跟踪通常包含的信息不仅仅是这个简短的错误消息。您应该看到一条较长的消息，告诉您在哪个函数以及哪一行发生了错误。阅读完整的错误消息可以更快地找到代码中的可疑行。