In this tutorial, you’ll learn when to use the len() Python function and how to use it effectively. You’ll discover which built-in data types are valid arguments for len() and which ones you can’t use.

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.

Jun 23, 2025 · Learn how to use the Python len () function to quickly find the size of strings, lists, dictionaries, and other data structures. Discover practical examples and common mistakes to avoid …

Oct 26, 2025 · Learn what the len function does in Python, how to use it with lists, strings, and objects. Explore syntax, meaning, and coding examples.

Apr 11, 2025 · Complete guide to Python's len function covering strings, lists, dictionaries, custom objects, and practical examples.

Nov 14, 2025 · The len() function in Python is used to return the length (the number of items) of an object. The object can be a sequence (such as strings, lists, tuples) or a collection (such as …

May 23, 2022 · The len() function returns the number of items in an object. It is one of Python’s most commonly used built-in functions that calculates the length or size of various data types including …

In this tutorial, we will learn about the Python len () function with the help of examples.

In this tutorial, you will learn how to use the Python len () function to get the number of items of an object.