🧱 L03 — Classes Part 1 Self-Check Handout

Class: Year 9 Game On · 9GAMZA · Term 2 2026

Duration: 75 minutes (target ~50 minutes)

Marks: /75 total · Part A 20 · Part B 15 · Part C 20 · Part D 20

What we're checking: the class keyword, __init__, self, attributes (self.name), methods, creating instances. Every concept here is brand-new today — that's expected.

Rules: Answer EVERY question to unlock Submit. Once submitted, you'll see your score + correct answers. Auto-saves on this laptop. No looking things up.

0 / 21 questions complete

Part A — Predict the Output

10 questions · 2 marks each · ~15 minutes. Read carefully — don't run the code.

A1 (2 marks)

What prints?

class Dog:
    def __init__(self, name):
        self.name = name

d = Dog("Rex")
print(d.name)

Rex name self.name Error

A2 (2 marks)

What prints?

class Hero:
    def __init__(self, hp):
        self.hp = hp

h = Hero(100)
h.hp = 50
print(h.hp)

100 50 150 Error — can't change attributes after __init__

A3 (2 marks)

What prints?

class Counter:
    def __init__(self):
        self.value = 0

    def increment(self):
        self.value += 1

c = Counter()
c.increment()
c.increment()
c.increment()
print(c.value)

0 1 3 4

A4 (2 marks)

Which line will run when Character("Arrow", 100) is created?

class Character:
    def __init__(self, name, hp):
        self.name = name
        self.hp = hp

    def shout(self):
        print(self.name)

shout() __init__() Both shout() and __init__() Neither — you have to call them yourself

A5 (2 marks)

What prints?

class Pet:
    def __init__(self, name):
        self.name = name

a = Pet("Cat")
b = Pet("Dog")
print(a.name, b.name)

Cat Cat Dog Dog Cat Dog Dog Cat

A6 (2 marks)

What prints?

class Player:
    def __init__(self, name, hp):
        self.name = name
        self.hp = hp

    def take_damage(self, amount):
        self.hp -= amount

p = Player("Aria", 100)
p.take_damage(40)
p.take_damage(20)
print(p.hp)

100 60 40 20

A7 (2 marks)

What prints?

class Box:
    def __init__(self):
        self.items = []

    def add(self, item):
        self.items.append(item)

b = Box()
b.add("sword")
b.add("potion")
print(len(b.items))

0 1 2 Error

A8 (2 marks)

What prints? (Two instances do NOT share data.)

class Hero:
    def __init__(self):
        self.hp = 100

    def heal(self, amount):
        self.hp += amount

a = Hero()
b = Hero()
a.heal(50)
print(b.hp)

50 100 150 Error

A9 (2 marks)

What prints?

class Hero:
    def __init__(self, hp):
        self.hp = hp

    def is_alive(self):
        return self.hp > 0

h = Hero(0)
print(h.is_alive())

True False 0 None

A10 (2 marks)

Which TWO are correct ways to access an attribute? (Pick the option that lists exactly the correct ones.)

class Pet:
    def __init__(self, name):
        self.name = name

p = Pet("Rex")
# Which of these work?
# (i)   p.name
# (ii)  p["name"]
# (iii) Pet.name(p)
# (iv)  print(p.name)

(i) and (iv) only (i), (ii), and (iv) (i), (iii), (iv) All four work

Part B — Fill in the Blank

5 questions · 3 marks each · ~10 minutes. Type the missing line of code.

B1 (3 marks)

Fill in the blank — the class definition line for a Dog class.

_________________
    def __init__(self, name):
        self.name = name

B2 (3 marks)

Fill in the blank — the __init__ signature for a Hero with name and hp parameters.

class Hero:
    _________________
        self.name = name
        self.hp = hp

B3 (3 marks)

Fill in the blank inside __init__ to store the hp value as an attribute.

class Hero:
    def __init__(self, hp):
        _________________

h = Hero(100)
print(h.hp)   # 100

B4 (3 marks)

Fill in the blank — a method shout that prints "RAWR".

class Dragon:
    def __init__(self):
        pass

    _________________
        print("RAWR")

B5 (3 marks)

Fill in the blank — create an instance of Player with name "Sam" and hp 100.

class Player:
    def __init__(self, name, hp):
        self.name = name
        self.hp = hp

_________________
print(p.name)   # Sam

Part C — Debug

4 questions · 5 marks each · ~20 minutes. Find the bug, write the fix, explain in your own words (min 15 chars).

C1 (5 marks)

This Dog class is missing something — every method needs ONE special thing as its first parameter. Fix the __init__ line.

class Dog:
    def __init__(name):
        self.name = name

# TypeError when running Dog("Rex")

Fixed first line of __init__: Explain the bug (1 sentence):

C2 (5 marks)

This Hero class doesn't actually store the hp. Fix the line inside __init__.

class Hero:
    def __init__(self, hp):
        hp = hp        # ← does nothing useful

h = Hero(100)
print(h.hp)   # AttributeError: 'Hero' object has no attribute 'hp'

Fixed line: Explain the bug (1 sentence):

C3 (5 marks)

This code prints something weird (the method object, not the result). Fix the last line.

class Hero:
    def __init__(self, hp):
        self.hp = hp

    def is_alive(self):
        return self.hp > 0

h = Hero(50)
print(h.is_alive)
# Prints: <bound method Hero.is_alive of ...>
# Should print: True

Fixed last line: Explain the bug (1 sentence):

C4 (5 marks)

This take_damage method has TWO bugs: missing self as a parameter AND wrong attribute access. Fix the def line and the body line.

class Hero:
    def __init__(self, hp):
        self.hp = hp

    def take_damage(amount):     # ← bug 1
        hp -= amount             # ← bug 2

h = Hero(100)
h.take_damage(20)

Fixed def line + fixed body line (write both, comma-separated): Explain the bug (1 sentence):

Part D — Coding Tasks (Write Python)

2 questions · 10 marks each · ~30 minutes. Write the class in VS Code, paste it below, then paste what your test prints.

D1 (10 marks)

Task: Write a Player class with three things: a name attribute, an hp attribute (starting at 100), and an attack(target) method that subtracts 10 from the target's hp.

Test your class with this code:

hero = Player("Aria")
goblin = Player("Goblin")
hero.attack(goblin)
hero.attack(goblin)
print(hero.name, hero.hp)
print(goblin.name, goblin.hp)

Expected output:
Aria 100
Goblin 80

Your full Player class (and the test code if you want to include it): What did your code print? (paste both output lines, comma-separated):

D2 (10 marks)

Task: Write a Pet class with: a name attribute, a hunger attribute (starts at 5), a feed() method that decreases hunger by 2 (but never below 0), and an is_hungry() method that returns True if hunger is more than 3.

Test your class with this code:

p = Pet("Rex")
print(p.is_hungry())   # True (hunger=5, more than 3)
p.feed()
print(p.is_hungry())   # False (hunger=3, NOT more than 3)
p.feed()
p.feed()
print(p.hunger)        # 0 (capped, can't go below)

Expected output:
True
False
0

Your full Pet class: What did your code print? (paste the 3 output lines, comma-separated):

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