Computer Science

a dynamic data structure that can contain items of different data types

describes a list or array that has both columns and rows of values

a static data structure that contains items of the same data type

2D arrays and lists

String handling

Substrings

String manipulation

Arrays and lists

List methods

2D lists challenge

Programming project - Sense HAT I

Programming project - Sense HAT II

This unit introduces pupils to string-handling techniques, they will explore how a string can be iterated over using a loop and sliced to create substrings. Pupils will be introduced to arrays and lists and explore the differences between the two. They will manipulate with a variety of list methods.

Programming: strings and lists

a list that contains multiple one-dimensional lists inside it

How do you access the value at row index 1 and column index 2 in the following 2D list?
```grades = [
    ["Math", "Science", "History"],
    [85, 90, 78]
]```

Which of the following correctly defines a 2D list in Python?

What will be the output of the following code?
```table = [
    ["apple", "banana", "cherry"],
    [3, 2, 5]
]
print(table[0][1])```

The {{}}() method can be used to add a new row to a 2D list.

How can you change the value "dog" to "cat" in the following 2D list?
```animals = [
    ["lion", "tiger", "dog"],
    ["parrot", "eagle", "owl"]
]```

inserts hamster at index position `[1]`, shifting the other items

inserts hamster at index position `[0]`, replacing dog

What does this code do?
```animals = ["dog", "cat", "rabbit"]
animals.insert(1, "hamster")
print(animals)```

What will be the output of the following code?
```colors = ["red", "blue", "green", "blue"]
print(colors.count("blue"))```

Which method would you use to add an item to the end of a list?

removes an item at a given index and returns it

What does the `pop()` method do in a Python list?

 What is the correct way to remove "apple" from the following list?
```fruits = ["banana", "apple", "cherry"]```

A {{}} can return multiple values by placing them in a list.

This lesson will be removed by end of Summer Term 2025.

2D arrays and lists

Lesson outcome

This lesson will be removed by end of Summer Term 2025.