List Methods – Real Python

Python List Methods: A Practical Guide to Work with Lists

Python List Functions & Methods Tutorial and Examples

Python: Find Average of List or List of Lists • datagy

From an introduction to lists in Python, showing how to use len() and sum() to find the mean (average) of a list of numbers. | Grok Programming

Learn Python List Comprehension for Lists, Tuples, Dictionaries, Sets

List Comprehension in Python - A Helpful Illustrated Guide - Be on the Right Side of Change

List Comprehensions in Python (With Examples and Video) • datagy