Web Reference: 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. 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. The most popular solutions here generally only flatten one "level" of the nested list. See Flatten an irregular (arbitrarily nested) list of lists for solutions that completely flatten a deeply nested structure (recursively, in general).
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