Rotation of list, Python using modulo function-CodePudding

I am a beginner in Python. I am trying to solve the following problem using modulo function but I'm facing

error: list index out of range.

Problem: Given an array of integers arr[] of size N and an integer, the task is to rotate the array elements to the left by d positions.

Code:

def rotate(arr, d):
    temp= []
    n = len(arr)
    for i in range(n):
        temp[i]=temp[(i d)%n]
        return temp

CodePudding user response：

At this part of code temp[(i d)%n], you are trying to access an element of a list that is empty. Because of this, your program produces that error. You probably meant to write arr[(i d)%n] instead.

Also, when you write temp[i], Python expects your list to be longer than i.
Instead of this, you can use temp.append(element) to add an element at end of the list.

After these changes, your function should look like this.

def rotate(arr, d):
    temp = []
    n = len(arr)
    for i in range(n):
        temp.append(arr[(i d)%n])
    return temp