Among them is the list, a simple but versatile collection type. With a Python list, you can group Python objects together in a one-dimensional row that allows objects to be accessed by position ...

And you can describe the object type for a list with a hint in the format of list[<element type>]. Optional and Union types Some objects contain one of a couple of different types of objects.

These dynamically typed objects are referred to as mutable, and you also can create immutable objects whose value and types can’t be changed – the tuples we discussed last week are a good ...