Using Lists in Programs

Learning Objectives Iterate through a list using a loop to check each item. Use an item's index to read or change its value. Dynamically add and remove items from a list within a program. Use conditional statements (if/else) inside a loop to make decisions based on list items. Explain how to find the total number of items in a list. Create a new list by transforming items from an existing list. Have you ever collected items in a video game? 🎒 How does the game keep track of everything in your backpack? It uses a list! Today, we're going to learn advanced ways to work with lists, which are like super-powered containers for information. You'll learn how to loop through them, change items, and use them to make your programs smarter and more powerful. Real-Worl...

TermDefinitionExample Iteration (Looping)The process of repeating a set of instructions for every single item in a list, one by one.To greet every pet in the list `pets = ["cat", "dog", "fish"]`, you would iterate through the list and run the 'say hello' code for each pet. IndexThe position number of an item in a list. The first item is always at index 0, the second is at index 1, and so on.In the list `scores = [95, 88, 100]`, the number 95 is at index 0, and 100 is at index 2. LengthThe total number of items contained inside a list.The length of the list `colors = ["red", "green", "blue"]` is 3. AppendTo add a new item to the very end of an existing list.If you have `shopping_list = ["milk", "eggs"...

Looping Through a List (Iteration) for item in my_list: Use this pattern to perform an action for every single item in a list. The variable 'item' will hold the value of the current list element in each pass of the loop. Accessing an Item by Index my_list[index_number] Use this syntax to get or change the value at a specific position in the list. Remember that the first item is at index 0. Adding and Removing Items my_list.append(new_item) my_list.remove(item_to_remove) Use `.append()` to add an item to the end of a list. Use `.remove()` to find and delete the first occurrence of a specific item from the list.