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How to Get the Length of Nested List in Python

Discover how to efficiently calculate the total number of elements in a nested list using Python, including step-by-step explanations and sample code. --- This video is based on the question https://stackoverflow.com/q/72798664/ asked by the user 'daniel' ( https://stackoverflow.com/u/19442116/ ) and on the answer https://stackoverflow.com/a/72798687/ provided by the user 'mozway' ( https://stackoverflow.com/u/16343464/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to get length of nested list in Python Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Get the Length of Nested List in Python Working with nested lists in Python can be a bit tricky, especially when you need to calculate the total number of elements they contain. You might find yourself wondering, "How do I count all the elements in a nested list?" This guide will walk you through the process step-by-step to ensure you can tackle this problem with confidence. Understanding Nested Lists A nested list is simply a list that contains other lists as its elements. For example: [[See Video to Reveal this Text or Code Snippet]] In this example, my_list contains several elements, including two nested lists: [54, 5] and [3, 5]. To find out how many total entries are in my_list, you'll also need to consider the contents of these nested lists. The Recursive Approach To calculate the total length of a nested list, one efficient method is to use recursion. Recursion allows us to define a function that calls itself to process each element of the list, regardless of its depth. We can break down the process as follows: Step 1: Define the Recursive Function First, we need to define a function that takes a list as input. This function will check if the current element is a list itself. If it is, the function will call itself again to dive deeper into that list. If it's not a list, it simply counts that item as 1. Here’s a sample code snippet to demonstrate this: [[See Video to Reveal this Text or Code Snippet]] Step 2: Collecting the Elements (Optional) If you also want to collect all the elements from the nested list while counting them, you can modify the function a little. This can be useful if you need to work with or display the data later on. Here’s how you can enhance the function: [[See Video to Reveal this Text or Code Snippet]] Conclusion Calculating the length of a nested list in Python is simple once you understand how to utilize recursion. By breaking down the problem and summing up the counts from each list, you can accurately and efficiently determine the total number of elements present, regardless of their nesting depth. With this knowledge, you can now confidently handle nested lists in your Python projects! If you have any questions or comments, feel free to drop them below! Happy coding!