Web Reference: Mar 20, 2026 · In Python, an inner function (also called a nested function) is a function defined inside another function. They are mainly used for: Encapsulation: Hiding helper logic from external access. Code Organization: Grouping related functionality for cleaner code. Dec 10, 2025 · Learn how to create inner functions in Python to access nonlocal names, build stateful closures, and create decorators. Jan 6, 2020 · A nested function is simply a function within another function, and is sometimes called an "inner function". There are many reasons why you would want to use nested functions, and we'll go over the most common in this article.
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