How to iterate two lists in parallel - Python Last Updated : 22 Nov, 2024 Comments Improve Suggest changes Like Article Like Report Whether the lists are of equal or different lengths, we can use several techniques such as using the zip() function, enumerate() with indexing, or list comprehensions to efficiently iterate through multiple lists at once. Using zip() to Iterate Two Lists in ParallelA simple approach to iterate over two lists is by using zip() function in Python. we can combine two lists and iterate over them in parallel. It creates pairs of elements by matching elements from each list at the same index. Python a = [4, 5, 3, 6, 2] b= [7, 9, 10, 0] # Iterate over each element in the combined lists (a + b) for x, y in zip(a, b): print(x,y) Output4 7 5 9 3 10 6 0 Here is a list of Various Methods to Iterate two lists in Parallel.Table of ContentUsing For Loop with range()Using enumerate() Using For Loop with range()Apart from zip(), we can iterate two lists parallel if we use For Loop along with range. When using range(), we can iterate based on the indices of both lists, provided we ensure that we handle the case where the lists have different lengths. Python a = [4, 5, 3, 6, 2] b = [7, 9, 10, 0, 8] # Use range() to iterate over the shortest # list's length to avoid index out of range error for i in range(min(len(a), len(b))): print(a[i], " ", b[i]) Output4 7 5 9 3 10 6 0 Using enumerate() enumerate() function helps to iterate through each value in pair and helps to combine both index and the number. Python a = [4, 5, 3, 6, 2] b = [7, 9, 10, 0, 3] for n, f in enumerate(a): print(f," ",b[n]) Output4 7 5 9 3 10 6 0 2 3 Note: When the lists are of different lengths, using enumerate() with indexing can lead to an IndexError if you try to access an index in the longer list that doesn’t exist in the shorter one. Comment More infoAdvertise with us Next Article How to iterate two lists in parallel - Python manjeet_04 Follow Improve Article Tags : Python Python Programs Python list-programs Practice Tags : python Similar Reads How to iterate through a nested List in Python? A nested list is a list that contains other lists. Working with nested lists can seem tricky at first but it becomes easy once we understand how to iterate through them. This is the easiest way to loop through a nested list. We can use a for loop to access each sublist in the main list, and then use 3 min read How to Zip two lists of lists in Python? zip() function typically aggregates values from containers. However, there are cases where we need to merge multiple lists of lists. In this article, we will explore various efficient approaches to Zip two lists of lists in Python. List Comprehension provides a concise way to zip two lists of lists 3 min read How to Modify a List While Iterating in Python Modifying a list while iterating can be tricky but there are several ways to do it safely. One simple way to modify a list while iterating is by using a for loop with the index of each item. This allows us to change specific items at certain positions.Pythona = [1, 2, 3, 4] for i in range(len(a)): i 2 min read How to Append Multiple Items to a List in Python Appending multiple items to a list in Python can be achieved using several methods, depending on whether you want to extend the list with individual elements or nested collections. Letâs explore the various approaches.Using extend method (Adding multiple items from iterable)The list.extend() method 2 min read How to Compare Two Iterators in Python Python iterators are powerful tools for traversing through sequences of elements efficiently. Sometimes, you may need to compare two iterators to determine their equality or to find their differences. In this article, we will explore different approaches to compare two iterators in Python. Compare T 3 min read Like