TypeError:不支持的操作数类型-:'str'和'int' (Python)

I have written the code for quick sort in python, but this code is throwing an error.

我已经在python中编写了快速排序的代码，但是这个代码正在抛出一个错误。

----------


    k=0
    def partition(arr,low_index,high_index):
        key = arr[low_index]
        i = low_index + 1;
        j = high_index

        while True:
            while (i<high_index and key>=arr[i]):
                i+=1
            while (key<arr[j]):
                j-=1
            if i<j:
                arr[i,j] = arr[j,i]
            else:
                arr[low_index,j]=arr[j,low_index]
                return j

    def quicksort(arr,low_index,high_index):
         if low_index < high_index:
            j = partition(low_index,high_index,arr)
            print("Pivot element with index "+str(j)+" has thread "+str(k))
            if left<j:
                k=k+1
                quicksort(arr,low_index, j - 1)
            if i<right:
                k=k+1
                quicksort(arr,j+1,high_index)
         return arr

    n = input("Enter the value n ")
    arr=input("Enter the "+str(n)+" no. of elements ")
    brr=quicksort(arr,0,n-1)
    print("Elements after sorting are "+str(brr))

----------

The error it is throwing is

它抛出的错误是

Enter the value n 4

输入值n4

Enter the 4 no. of elements [5,6,2,7] Traceback (most recent call last): File "C:\Users\devendrabhat\Documents\dev\dev\quick.py", line 38, in brr=quicksort(arr,0,n-1) TypeError: unsupported operand type(s) for -: 'str' and 'int'

进入4号[5,6,2,7] Traceback(最近一次调用):File "C:\Users devendrabhat\Documents\dev\dev\ dev\dev\ dev\dev\ dev\dev\ dev\dev\quick "py"，第38行，在brr=quicksort(arr,0,n-1)类型错误:为-:'str'和'int'的不支持操作数类型(s)

3 个解决方案

#1

n is string. So you need to change it to int:

n是字符串。所以你需要把它改成int:

n = int(n)

If you input [5,6,2,7] on line 37, python interpret it as string like "[5,6,2,7]". So, you need to convert string to list.

如果您在第37行输入[5,6,2,7]，python会将其解释为“[5,6,2,7]”之类的字符串。因此，需要将字符串转换为list。

arr = eval(arr)

#2

You need to change n to an integer, not a string. Your error is telling you, that you are trying to perform an operation (- in this case) on a string and an integer. Change str(n) to int(n) so you have the same type throughout.

你需要把n变成一个整数，而不是一个字符串。您的错误告诉您，您正在尝试对字符串和整数执行操作(在本例中)。将str(n)更改为int(n)，以便始终具有相同的类型。

#3

you are declaring 'n' as string there in your code. And trying to perform arithmetic operation with string.

在代码中，你将n声明为字符串。并尝试用字符串进行算术运算。

So it is giving that error. Change this str(n) to int(n).

它给出了这个误差。将这个str(n)改为int(n)

It will work !!!

它将工作! ! !

#1