Web Reference: In this tutorial, you'll learn how and when to use the len () Python function. You'll also learn how to customize your class definitions so that objects of a user-defined class can be used as arguments in len (). Definition and Usage The len() function returns the number of items in an object. When the object is a string, the len() function returns the number of characters in the string. Jul 23, 2025 · The len () function in Python is used to get the number of items in an object. It is most commonly used with strings, lists, tuples, dictionaries and other iterable or container types.
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