Chapter Practice Arena

Object-Oriented Programming Problems

Targeted practice challenges specifically curated for this chapter. Inspect hints, verify outputs, and check Pythonic solutions.

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Showing 6 challenges · 22 total · Page 1 of 4

#1beginnerInstance Methods and self

Create a Counter class initialized with value 0. Add an increment() method that increases value by one. Call it twice and print the final value.

Starter Code

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

    # Define increment() here
    pass

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

Expected Output:2

#2intermediateEncapsulation and Properties

Create a BankAccount class that accepts an initial balance and exposes it through a read-only balance property. Add a deposit(amount) method that accepts only positive amounts. Starting with 100, deposit 25 and print the balance.

Starter Code

class BankAccount:
    def __init__(self, balance):
        # Store the initial balance.
        pass

    # Define a read-only balance property.

    def deposit(self, amount):
        # Validate and add the deposit.
        pass

account = BankAccount(100)
account.deposit(25)
print(account.balance)

Expected Output:125

#3intermediateDataclasses and Special Methods

Define a Rectangle dataclass with width and height fields. Use __post_init__() to raise ValueError if either dimension is less than or equal to zero. Create Rectangle(4, 5) and print it.

Starter Code

from dataclasses import dataclass

# Define Rectangle with width and height.
# Validate both dimensions in __post_init__().

print(Rectangle(4, 5))

Expected Output:Rectangle(width=4, height=5)

#4intermediateClasses and Instances

Create a Product class whose initializer stores name and price. Create a product named "Pen" with price 10, then print the name and price on separate lines.

Starter Code

class Product:
    def __init__(self, name, price):
        # Store both attributes
        pass

product = Product("Pen", 10)
# Print name and price

Expected Output:Pen 10

#5beginnerClasses and Instances

Create a Book class whose initializer accepts a title and stores it in self.title. Create a Book instance with the title "Dune" and print its title.

Starter Code

class Book:
    # Define the initializer
    pass

book = Book("Dune")
print(book.title)

Expected Output:Dune

#6beginnerEncapsulation and Properties

Create a Circle class that stores radius and exposes a diameter property returning radius multiplied by 2. Create Circle(3) and print its diameter.

Starter Code

class Circle:
    def __init__(self, radius):
        self.radius = radius

    # Define the diameter property here.

circle = Circle(3)
# Print the diameter.

Expected Output:6