40.Rotate an Array in Python | Left & Right Rotation by K Steps

In this tutorial, you’ll learn how to rotate an array to the left or right by k steps in Python — step by step, without using slicing shortcuts. 👉 What you’ll learn: The difference between left rotation and right rotation How to implement both manually using loops & modulo Step-by-step dry run explanation Common interview variations of array rotation 💡 This is a must-know coding interview question for Data Structures & Algorithms (DSA). 🔔 Subscribe for more Python & DSA tutorials! # --------------------------------------------- # 🚀 Program: Rotate an Array by K Steps # --------------------------------------------- def rotate_array(arr, k, direction="right"): n = len(arr) # Length of array if n == 0: # Edge case: empty array return arr k = k % n # Normalize k rotated = [0] * n for i in range(n): if direction == "right": # Right rotation new_index = (i + k) % n else: # Left rotation new_index = (i - k) % n rotated[new_index] = arr[i] return rotated # --------------------------------------------- # ✅ Example usage # --------------------------------------------- arr = [1, 2, 3, 4, 5, 6, 7] print("Right Rotation by 3:", rotate_array(arr, 3, "right")) # [5, 6, 7, 1, 2, 3, 4] print("Left Rotation by 3:", rotate_array(arr, 3, "left")) # [4, 5, 6, 7, 1, 2, 3] #Python #LearnPython #PythonProgramming #Coding #DSA #ArrayRotation #PythonForBeginners #InterviewPreparation #CodingInterview #LeetCode #DataStructures #Algorithms #PythonTutorial #RotateArray #ProblemSolving