Question

我正在尝试按升序和降序排序用户输入的数字，但是append方法一直在替换先前的值，因此我只在订购中得到一个数字。

print("This is a program to order numbers in ascending and descending order.")
while 1 == 1:
    until = int(input("\nEnter how many numbers you want ordered: "))
    print("")
    loop = 0
    while loop < until:
        numbers = []
        number = float(input("Enter number: "))
        numbers.append(number)
        loop += 1
    print("\nHere are the numbers in descending order:")
    while len(numbers) > 0:
        print(max(numbers))
        largest = max(numbers)
        numbers.remove(largest)

Answer 1

在您的代码中，您在循环中编写了以下行;

numbers = []

每次遍历循环时，您将创建一个新变量numbers，因此每次迭代都会覆盖它。

试试这个;

print("This is a program to order numbers in ascending and descending order.")
while 1 == 1:
    until = int(input("\nEnter how many numbers you want ordered: "))
    print("")
    loop = 0
    numbers = []
    while loop < until:            
        number = float(input("Enter number: "))
        numbers.append(number)
        loop += 1
        print("\nHere are the numbers in descending order:")
    while len(numbers) > 0:
        print(max(numbers))
        largest = max(numbers)
        numbers.remove(largest)

Answer 2

问题是由numbers = []循环中的行while引起的。在您附加下一个数字之前，这会在每次迭代时将numbers重置为空列表。

要解决此问题，只需将此行移至while循环之外，如下所示：

loop = 0
numbers = []
while loop < until:
    number = float(input("Enter number: "))
    numbers.append(number)
    loop += 1

请注意，在此实例中，您还不需要loop变量。您可以直接测试numbers列表的长度，如下所示：

numbers = []
while len(numbers) < until:
    number = float(input("Enter number: "))
    numbers.append(number)

Answer 3

您的号码是本地的

print("This is a program to order numbers in ascending and descending order.")
while 1 == 1:
    numbers = []
    until = int(input("\nEnter how many numbers you want ordered: "))
    print("")
    loop = 0
    while loop < until:
        #numbers = []
        number = float(input("Enter number: "))
        print(number, numbers)
        numbers.append(number)
        loop += 1
    print("\nHere are the numbers in descending order:")
    while len(numbers) > 0:
        print(max(numbers))
        largest = max(numbers)
        numbers.remove(largest)

Answer 4

在您的初始代码中，您说明您需要按降序排列的数字，我还没有提供完整的解决方案，但是大致了解哪里可以使用您目前拥有的内容。只需要根据用户需求，降序或升序添加更多逻辑。我不知道为什么你有数字。删除（最大）所以我评论了

    numbers = []
    print("This is a program to order numbers in ascending and descending order.")
    numbers
    while True:

        until = int(input("\nEnter how many numbers you want ordered: "))
        print("")
        loop = 0
        while loop < until:

            number = float(input("Enter number: "))
            numbers.append(number)
            loop += 1
        print("\nHere are the numbers in descending order:")
        numbers.sort()
        print(numbers)
        largest = max(numbers)
        #numbers.remove(largest)

如我原来的评论中所述＆＃34;声明你的列表编号= []高于一个等级，你试过吗？＆＃34;

如何防止Python的追加方法替换现有值？

4 个答案: