Web Reference: In this tutorial, you'll learn how to flatten a list of lists in Python. You'll use different tools and techniques to accomplish this task. First, you'll use a loop along with the .extend () method of list. Then you'll explore other tools, including reduce (), sum (), itertools.chain (), and more. To make this more readable, you can make a simple function: def flatten_list(deep_list: list[list[object]]): return list(chain.from_iterable(deep_list)). The type hinting improves the clarity of what's going on (modern IDEs would interpret this as returning a list[object] type). Jul 23, 2025 · Flattening a list of lists means turning a nested list structure into a single flat list. This can be useful when we need to process or analyze the data in a simpler format. In this article, we will explore various approaches to Flatten a list of Lists in Python.
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