Computer Science

a data structure that has a fixed size in memory

a data structure that can grow or shrink to accommodate items

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

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

Arrays and lists

String handling

Substrings

String manipulation

List methods

2D arrays and lists

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

Arrays are dynamic data structures that allow adding and deleting items.

Arrays store items of different data types.

The size of an array is fixed, and items must all be of the same type.

Arrays can grow or shrink in size as needed.

Which of the following is true about arrays?

`planets = ("Mercury", "Venus", "Earth")`

`planets = ["Mercury", "Venus", "Earth"]`

What is the correct way to create a list in Python?

In Python, the index of the first item in a list starts at {{}}.

Which of the following methods allows you to pick a random planet from the list planets?

Lists are {{}} data structures, meaning they can have items added or removed and can store different data types in the same list.

Arrays are {{}} data structures, meaning they cannot have items added or removed and they must contain items of the same data type.

What will be the output of this program?
```word = "MOONLIGHT"
print(word.lower())```

selects a random item from a list or string

What does the `random.choice()` function do?

What will be the output of this program?
```fruit = "Strawberry"
print(fruit[5:10].upper())```

{{}} is a way of joining strings using the `+` operator to make a new string.

{{}} is the process of checking an input meets certain requirements.

What must be included in a Python program to use the random module?

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

Arrays and lists

Lesson outcome

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