List extend python1/17/2024 We looped over each item, or list, in the list of lists and added each item’s values to our flat_list.We generated a new list, called flat_list.Let’s break down what we’ve done here step-by-step: Let’s see how we can accomplish this with Python: # Use a for-loop to flatten a list of lists In our for-loop, we’ll loop over each item in the list and add each item to a new list. Now that you know what a Python list of lists is, let’s see how we can use a Python for-loop to flatten them! How to Use a Python For Loop to Flatten Lists of Lists? In the next section, you’ll learn how to use a naive method, a for-loop, to flatten a list of lists. ![]() This is what we mean by lists of lists – they are lists that contain other lists. We can see here that the third item of our list list_of_lists is actually another list. When we try to access the third item, index position 2, we can print out what it contains: list_of_lists =, , ] Let’s take a look at a simple list of lists in Python, so that you can have a visual depiction of what they actually look like: list_of_lists =, , ] Learn four different ways to do this in this tutorial! When you convert a list of lists, or a 2-dimensional array, into a one-dimensional array, you are flattening a list of lists. This continues onwards, as we add more and more layers. When one or more of these lists contain another list, we say they’re called 3-dimensional. In fact, lists of lists in Python can even contain other lists of lists! We can say that a list that contains only one other layer of lists is called a 2-dimensional list of lists. In Python, a list of a lists is simply a list that contains other lists.
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