Python compare two lists return matches. Otherwise, if the goal is to compare each pair of elements in the corresponding positions, then we simply iterate pairwise and check each pair. In this article, we’ll explore different ways on how to compare two lists in Python and identify Jul 11, 2023 · How to compare two lists in Python and return matches with examples. Nov 28, 2014 · I have two lists of unequal length and I would like to compare and pull matched values in the order from the first list, so a in this example. Nov 2, 2023 · List comprehension provides a concise way to create new lists based on existing lists or other iterable objects. Jul 23, 2025 · In Python, there might be a situation where you might need to compare two lists which means checking if the lists are of the same length and if the elements of the lists are equal or not. You want to perform either of the following: 1. 2. Whether you’re looking for missing items, checking for duplicates, or verifying that the values in two lists match, comparing lists is a common task in many real-world applications. To compare two lists and return the matches, you can use the built-in intersection () method of the set data type. Dec 5, 2024 · Discover effective methods to compare two lists in Python, find duplicates, and improve your coding skills with practical examples. Feb 17, 2025 · If you’ve ever worked with lists in Python, you’ve probably needed to compare them to see what’s different. Let us explore this with a simple example of comparing two lists. Sep 8, 2025 · In this tutorial, I’ll show you step by step how to compare two lists in Python and return the non-matching elements. I have to lists with some similiar elements, I want to get the non -matching elements. To compare two lists and return the matches using list comprehension, you can iterate over one list and check if each element is present in the other list. Use a loop that goes through the lists and compares the lists elements and displays only the list elements that duplicate (the element exists in both lists). len(h) = 1973182 #h[0 Oct 20, 2021 · In this article, we’ll look at how to compare two lists and return matches with Python. Each method is simple, and I’ll also share complete code examples. Difference: Find the difference of elements in the first list but not in the second. Discover fast ways to find matches, differences, and shared values. Boolean Comparison: Compare the lists element-wise and return True if your comparison metric returns True for all pairs of elements, and otherwise False. If the goal is to find all the elements that are common to both lists (regardless of where they appear in the list), that is a list intersection. a = ['a','s','d','f'] Dec 12, 2021 · Learn to compare if two lists are equal, find elements that match, get the difference between 2 lists, compare lists of dictionaries, and list of strings. In this tutorial, you’ll learn how to compare two lists in Python Programming Language and return the matches and differences between them. The strings should be displayed even if in one is used uppercase and in the other lowercase or a combination of it. We’ll explore different methods to achieve this comparison. May 31, 2019 · I checked this comparing lists, Only one answer is relative to what I am trying to do. Jun 30, 2014 · I'd like to compare these two lists and return a new list with nodeIDs, x, y, z of nodes that do not match the nodeIDs of subsetA_nodeID. Let's explore other methods to find the difference between two lists in Python. May 29, 2015 · For two lists a and b, how can I get the indices of values that appear in both? For example, a = [1, 2, 3, 4, 5] b = [9, 7, 6, 5, 1, 0] return_indices_of_a(a, b Jun 27, 2020 · Problem: Given are two lists l1 and l2. Mar 1, 2016 · I think you might be answering the wrong question though, the answer by zondo is Pythonic and correct (albeit, possibly inefficient, but readability should not often be sacrificed for efficiency in Python). Jul 21, 2025 · Learn how to compare two lists in Python using equality, sets, loops, and more. Feb 25, 2021 · You have 2 lists of strings with contents of your choice. Jul 25, 2021 · How to compare two lists in Python? Using lambda function, sort(), set() method to check if two lists are equal and have same elements. Example: You start with two lists. Feb 20, 2025 · Explanation : list (set (a) - set (b)) calculates the difference between two sets using the - operator, returning elements in a but not in b and then converts the result back into a list. append([line]) This code is totally inefficient. I could do it like: new_list = [] for line in nodes: for nodeID,x,y,z in line: for line2 in subsetA_nodeID: if line2[0] == nodeID: else: new_list. htc wrwfu fk6y1 i4 jqq1 jg3h6rx egcf5 miw c1 6s6q3f