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Tuples – Practical Use

Tuples group related fixed values, return multiple values from a function, and can be used as dictionary keys

Part of: Python Coding — Module 61, WA Computer Science ATAR Year 11 — Modular Programming — Module 20

Understanding Tuples – Practical Use in Python

What it does: Using enum members makes comparisons self-documenting. Looping over an enum yields each member in definition order. An invalid enum name raises AttributeError; a mistyped string silently passes. if status == Status.ACTIVE: is clearer and safer than if status == 'active':. auto() assigns the next available integer so you don't need to number each member manually. Enum members are hashable (immutable) so they work as dict keys and set members. Use enums when you have a defined list of valid options that won't change. Size.SMALL is the key — looking it up returns the value 5.

Common mistakes: Compare with enum member, not string: prevents typos. String key typo passes silently. Enum key would cause clear error.

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This module's key terms are also in a printable crossword (Modules 51–63) and word search (Modules 41–63).

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Learning
Duo
Why use Color.RED instead of 'red'?
Typos cause errors immediatelyIt's shorter
Matches
❌ if status = Status.ACTIVE:
↓
Error: Use == not = for comparison
Applying
Meanings
Term
Tuples
Meaning
A tuple is an ordered, fixed-size collection of values. Conceptually, it acts like a single record or row (e.g., a person's name and age), where each specific position holds a distinct piece of related data.
Practice
from enum import Enum
Testing
Gaps
from enum import Enum,
Check Answer
Spots
4 INACTIVE = 2
5if status == 'active':

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Quick Questions

1. Why use Color.RED instead of 'red'?
A. It's shorter
B. Typos cause errors immediately ✓
An invalid enum name raises AttributeError; a mistyped string silently passes
2. Can enums be used in if/elif chains?
A. No
B. Yes great for state machines ✓
if status == Status.ACTIVE: is clearer and safer than if status == 'active':
3. What does auto() do?
A. Automatically assigns incrementing values ✓
B. Creates the class
auto() assigns the next available integer so you don't need to number each member manually
4. Can enums be dictionary keys?
A. Yes they are hashable ✓
B. No
Enum members are hashable (immutable) so they work as dict keys and set members
5. When should you use enums?
A. For a fixed set of choices (like status, direction, color) ✓
B. For all variables
Use enums when you have a defined list of valid options that won't change

Match the Pairs

if status = Status.ACTIVE: → Error: Use == not = for comparison
for item in Status.members: → Error: Use for item in Status: to iterate
if status == Status.ACTIVE: → Valid: Compare enum members with ==
for item in Status: → Ok: Iterate through all enum members
min(3, 1, 4, 1, 5) → Output: 1
max(3, 1, 4, 1, 5) → Output: 5

Key Term

Tuples
A tuple is an ordered, fixed-size collection of values. Conceptually, it acts like a single record or row (e.g., a person's name and age), where each specific position holds a distinct piece of related data.

Fill in the Blanks

1. from enum import Enum, auto class Color(Enum): RED = auto()
2. prices = {Size.SMALL: 5} print(prices[Size.SMALL])
3. if status == Status.ACTIVE: print('Active')
4. for item in Color: print(item.name)
5. class Size(Enum): SMALL = auto()

Spot the Error

Question 1
A from enum import Enum
B class Status(Enum):
C ACTIVE = 1
D INACTIVE = 2
E if status == 'active':
Line E — Compare with enum member, not string: prevents typos
Question 2
A prices = {'SMALL': 5, 'MEDIUM': 8}
B size = 'SMALL'
C cost = prices['SMAL']
D print('Cost:', cost)
Line C — String key typo passes silently. Enum key would cause clear error.
Question 3
A from enum import Enum, auto
B
C class Color(Enum):
D RED = auto
E GREEN = auto
Line D — auto needs parentheses: auto() not just auto
Question 4
A def paint(color):
B if color == 'red':
C pass
D
E paint('rad')
Line E — String 'rad' passes silently. Enum Color.RED would error immediately.
Question 5
A from enum import Enum
B class Color(Enum):
C RED = 1
D
E if color == Color.RED.value:
Line E — Compare with the member (Color.RED), not its value: loses type safety

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