Python Lists: Mutation & Building Patterns

Python lists are made to change. This Block shows you how to grow and edit an existing list with append(), replace an item through index assignment, and remove items with pop() or remove(). You will also see what each operation returns, how indexes shift after removal, and what happens when a requested index or value is missing.

What you will learn:

• Add one item to the end of an existing list with append()
• Replace an item at a known position using index assignment
• Remove the last item or an item at a specific index with pop()
• Remove the first matching value with remove()
• Choose the right operation and avoid common IndexError, ValueError, and None pitfalls

Leave with a clear way to choose the right operation based on whether you know an item's position, its value, or need to keep the removed item.