Computer Science
Grade 5
20 min
Data Types: Numbers, Text, and More!
Understand different data types and how to choose the appropriate type for each field.
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1
Introduction & Learning Objectives
Learning Objectives
Identify the four main data types in Python: integer, string, float, and boolean.
Write an `if/elif/else` statement that makes decisions based on the value of a number or text variable.
Use comparison operators (==, >, <) to compare different data types inside a conditional.
Write a `for` loop that iterates through a list containing different data types.
Use the `type()` function inside an `if` statement to check if a variable is a number or text.
Explain why mixing numbers and text with a `+` sign can cause an error.
Have you ever played a game that asks for your name and then your age? 🤔 How does the computer know one is text and the other is a number?
In this lesson, we'll explore the different 'types' of data a computer understa...
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Key Concepts & Vocabulary
TermDefinitionExample
Integer (int)A whole number, without any decimal points. It can be positive, negative, or zero.In `player_score = 150`, the number 150 is an integer.
String (str)A sequence of characters, like letters, numbers, or symbols, wrapped in quotes.In `player_name = "Alex123"`, the text "Alex123" is a string.
FloatA number that has a decimal point.In `distance = 9.5`, the number 9.5 is a float.
Boolean (bool)A data type that can only have one of two values: `True` or `False`. It's like a computer's way of saying 'yes' or 'no'.In `is_game_over = False`, the value `False` is a boolean.
ListA container that holds an ordered collection of items. The items can be of different data types.In `inventory = ["sword", 5, "...
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Core Syntax & Patterns
The `if/elif/else` Decision Maker
if condition:
# code to run if condition is True
elif another_condition:
# code to run if first is False and this is True
else:
# code to run if all above are False
Use this structure to make your program choose what to do. The conditions often check the value of a variable, comparing numbers with `>` or `<` and text with `==`.
The `for` Loop Item Processor
for item in my_list:
# code to run for each item
Use a `for` loop to do something for every single item in a list, one by one. The `item` variable holds the current item from the list as the loop runs.
The `type()` Checker
type(variable_name)
This special function tells you the data type of a variable. You can use it in an `if` statement like this: `if type(p...
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Challenging
A program has the variable `player_level = "25"`. The code `if player_level > 10:` is written to check if the player is high-level. Why will this code cause an error or not work as expected?
A.You cannot use the `>` operator to compare a string ("25") and an integer (10).
B.The variable name `player_level` is too long.
C.The number 10 should have been written in quotes, like `"10"`.
D.The `if` statement is missing an `else` part.
Challenging
Based on the 'Sorting a Backpack' example, what will be the complete output of this code?
`backpack = ["map", 12.5, 3]`
`for item in backpack:`
`if type(item) == str:`
`print("Item:")`
`else:`
`print("Amount:")`
A.Item:
Amount:
Amount:
B.Item:
Item:
Item:
C.Amount:
Amount:
Item:
D.Item:
Float:
Integer:
Challenging
A programmer wrote this code to give awards based on score, but it has a logical flaw. If a player's score is 95, they should get a 'Gold medal', but they get a 'Silver medal' instead. Why?
`score = 95`
`if score > 50:`
`print("Silver medal")`
`elif score > 90:`
`print("Gold medal")`
A.The `>` operator should be `<`.
B.The `elif` should be another `if`.
C.The condition `if score > 90` should be checked before `if score > 50`.
D.The scores 50 and 90 should be in quotes.
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