Using the len() Function in Python
In many situations, you’ll need to find the number of items stored in a data structure. Python’s built-in function len() is the tool that will help you with this task.
There are some cases in which the use of len() is straightforward. However, there are other times when you’ll need to understand how this function works in more detail and how to apply it to different data types.
In this tutorial, you’ll learn how to:
- Find the length of built-in data types using
len() - Use
len()with third-party data types - Provide support for
len()with user-defined classes
By the end of this article, you’ll know when to use the len() Python function and how to use it effectively. You’ll