List Operations

Learning Objectives Add a new item to the end of a list using the .append() method. Remove a specific item from a list using the .remove() method. Access an item in a list using its index number. Change an item at a specific index in a list. Find the total number of items in a list using the len() function. Explain that Python list indices start at 0, not 1. Imagine you have a shopping list for the grocery store, but you keep remembering new things to add or deciding to remove items. How can you tell a computer to manage that list for you? 🛒 In this lesson, you will learn how to work with Python lists! We will explore how to add, remove, find, and change items in a list. This is a super important skill for making fun programs like games and apps. Real-World Applications...

TermDefinitionExample ListA special type of variable that can hold an ordered collection of items. Lists are created using square brackets [ ].my_pets = ["dog", "cat", "fish"] ElementA single item inside a list.In the list my_pets, "dog" is the first element. IndexThe position number of an element in a list. The first item always has an index of 0.In my_pets = ["dog", "cat", "fish"], the index of "dog" is 0, and the index of "fish" is 2. AppendAn operation that adds a new element to the very end of a list.my_pets.append("hamster") would add "hamster" to the end of the list. RemoveAn operation that finds and deletes the first matching element from a list.my_pets.remove("cat&qu...

Adding an Item (Append) list_name.append(new_item) Use this when you want to add a new item to the end of an existing list. The item goes inside the parentheses. Removing an Item list_name.remove(item_to_remove) Use this when you want to remove a specific item from a list. You must know the exact value of the item you want to remove. Accessing an Item by Index list_name[index_number] Use this to get the value of an item at a specific position. Remember, the first item is at index 0. Changing an Item by Index list_name[index_number] = new_value Use this to replace an existing item in the list with a new one. You identify the item to change by its index number.