#AP Computer Science Principles: List Operations - The Night Before 🚀

Hey! Let's get you prepped for the AP CSP exam with a super-focused review of list operations. We'll make sure you're not just memorizing, but understanding how lists work. Let's dive in!

#Basic List Operations

Lists are fundamental in programming, and they're a big deal on the AP exam. Remember, AP Pseudocode starts indexing at 1, but in most programming languages like Python, it starts at 0. Keep this in mind to avoid common mistakes!

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Think of a list like a set of numbered mailboxes. To get something from a specific box, you use its number (the index).

• How it works: list_name[index]
• Example:

python grocery_list = ["milk", "eggs", "cheese"] print(grocery_list[0]) # Output: milk

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Assigning Element Values

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#### Assigning to a Variable

![](https://zupay.blob.core.windows.net/resources/files/0baca4f69800419293b4c75aa2870acd_c6ae50_520.png?alt=media&token=a16b04a1-200a-41bd-a044-91f4619284dd)

- You can grab an element from a list and store it in a variable.
- **Example:**

python grocery_list = ["milk", "eggs", "cheese"] change = "soap" grocery_list[2] = change print(grocery_list) # Output: ["milk", "eggs", "soap"]

#### Assigning a Value Directly

![](https://zupay.blob.core.windows.net/resources/files/0baca4f69800419293b4c75aa2870acd_9c2d56_1975.png?alt=media&token=5e5ce976-66a5-4657-ba7b-f56206ff0191)

- You can directly change the value of an element at a specific index.
- **Example:**

python grocery_list = ["milk", "eggs", "cheese"] grocery_list[2] = "fish" print(grocery_list) # Output: ["milk", "eggs", "fish"]

#### Assigning One Element to Another

![](https://zupay.blob.core.windows.net/resources/files/0baca4f69800419293b4c75aa2870acd_893a7c_1055.png?alt=media&token=5040c704-7717-4ef9-a3c5-...