array_rotation.py

"""
Python program for array rotation, i.e., take

  [1, 2, 3, 4, 5]

and rotate it, e.g., by 2, or

  [3, 4, 5, 1, 2]

Source: www.geeksforgeeks.org/python-program-for-program-for-array-rotation-2/
Author: Shreyanshi Arun
"""

#Function to left rotate arr[] of size n by d*/
def leftRotate(arr, d, n):
    for i in range(d):
        leftRotatebyOne(arr, n)

#Function to left Rotate arr[] of size n by 1*/
def leftRotatebyOne(arr, n):
    temp = arr[0]
    for i in range(n-1):
        arr[i] = arr[i+1]
    arr[n-1] = temp


# utility function to print an array */
def printArray(arr,size):
    for i in range(size):
        print ("%d"% arr[i],end=" ")


if __name__ == '__main__':
    
    # Driver program to test above functions */
    arr = [1, 2, 3, 4, 5, 6, 7]
    leftRotate(arr, 2, 7)
    printArray(arr, 7)