The index starts from 0, i.e. Python 3 program to Merge two lists and sort it : Python list is one of the most commonly used datatype. Merge Sort: It is used both concepts of recursion and non-recursion parameter inside algorithm. We can access any element using its index. Visualizing the algorithm can be done in 2 stages — first, the recursive splitting of the arrays, 2 each 2 at a time, and second, the merge operation. Problem statement − We are given an array, we need to sort it using the concept of merge sort. Is that true for Merge Sort? The list can hold different types of items. Another algorithm, called Timsort, is based on merge sort and insertion sort and is used under Python’s hood for its own sorted() function and .sort() methods. Algorithm of Merge Sort. Note: the pseudocode for the merge operation ignores the end cases. That means, if you have a list of N unsorted elements, it will take N log(N) operations. This Python tutorial helps you to understand what is Merge sort algorithm and how Python implements this algorithm. In this article, we will learn about the solution to the problem statement given below. Here’s the Python code to merge sort an array. That means it runs in O(N log(N)) time. Found by software developer Tim Peters in 2002, Timsort is a hybrid algorithm derived from merge-sort and insertion-sort algorithms. In this lesson, you will learn how to code sorting algorithms in Python. Well, we talked about it is one of the efficient sorting algorithm. Python uses Timsort, another tuned hybrid of merge sort and insertion sort, that has become the standard sort algorithm in Java SE 7, on the Android platform, and in GNU Octave External links Animated Sorting Algorithms: Merge Sort at the Wayback Machine … Python Program for Merge Sort. In python, the code of merge-sort contains two functions-Merge Function: This function is used to merge two arrays to form a single array. 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