MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 ChGenre: eLearning | Language: English | Duration: 6 Lessons (24m) | Size: 45.5 MB

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 s when you'll need to understand how this function works in more detail and how to apply it to different data types.

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




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