Assignment

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1️⃣ Classes, Objects, and Constructors (6 Assignments)

Assignment 1: Creating a Simple Class & Object

🔹 Task: Define a Car class with attributes brand and model, then create an object. 🔹 Example Snippet:

class Car:
    def __init__(self, brand, model):
        self.brand = brand
        self.model = model

car1 = Car("Toyota", "Corolla")
print(car1.brand, car1.model)

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Assignment 2: Adding a Method to a Class

🔹 Task: Modify the Car class to include a method display_info(). 🔹 Example Snippet:

class Car:
    def __init__(self, brand, model):
        self.brand = brand
        self.model = model

    def display_info(self):
        print(f"Car: {self.brand} {self.model}")

car1 = Car("Honda", "Civic")
car1.display_info()

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Assignment 3: Using Default Constructor Values

🔹 Task: Set default values for brand and model if no values are provided. 🔹 Example Snippet:

class Car:
    def __init__(self, brand="Unknown", model="Unknown"):
        self.brand = brand
        self.model = model

car1 = Car()
print(car1.brand, car1.model)

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Assignment 4: Modifying Object Attributes

🔹 Task: Change an object’s attribute value after creation. 🔹 Example Snippet:

class Car:
    def __init__(self, brand, model):
        self.brand = brand
        self.model = model

car1 = Car("Ford", "Mustang")
car1.model = "F-150"
print(car1.brand, car1.model)

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Assignment 5: Using a Class Variable

🔹 Task: Add a class variable wheels and access it via objects. 🔹 Example Snippet:

class Car:
    wheels = 4  # Class variable

    def __init__(self, brand, model):
        self.brand = brand
        self.model = model

car1 = Car("Tesla", "Model 3")
print(f"{car1.brand} has {Car.wheels} wheels")

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Assignment 6: Deleting an Object Attribute

🔹 Task: Remove an attribute from an object and handle errors. 🔹 Example Snippet:

class Car:
    def __init__(self, brand, model):
        self.brand = brand
        self.model = model

car1 = Car("BMW", "X5")
del car1.model

try:
    print(car1.model)
except AttributeError:
    print("Attribute no longer exists!")

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2️⃣ Inheritance, Polymorphism, Encapsulation (6 Assignments)

Assignment 7: Implementing Single Inheritance

🔹 Task: Create a Vehicle parent class and a Car child class. 🔹 Example Snippet:

class Vehicle:
    def __init__(self, speed):
        self.speed = speed

class Car(Vehicle):
    def __init__(self, brand, speed):
        super().__init__(speed)
        self.brand = brand

car1 = Car("Audi", 200)
print(car1.brand, car1.speed)

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Assignment 8: Using Method Overriding in Inheritance

🔹 Task: Override a method in a child class. 🔹 Example Snippet:

class Animal:
    def make_sound(self):
        print("Animal makes a sound")

class Dog(Animal):
    def make_sound(self):
        print("Dog barks")

dog = Dog()
dog.make_sound()

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Assignment 9: Implementing Multiple Inheritance

🔹 Task: Create a class that inherits from two parent classes. 🔹 Example Snippet:

class Engine:
    def start(self):
        print("Engine started")

class Wheels:
    def roll(self):
        print("Wheels rolling")

class Car(Engine, Wheels):
    pass

car1 = Car()
car1.start()
car1.roll()

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Assignment 10: Implementing Encapsulation (Private Variables)

🔹 Task: Use a private variable inside a class. 🔹 Example Snippet:

class BankAccount:
    def __init__(self, balance):
        self.__balance = balance  # Private variable

    def get_balance(self):
        return self.__balance

account = BankAccount(5000)
print(account.get_balance())

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Assignment 11: Using Getters and Setters

🔹 Task: Modify a private variable using getter and setter methods. 🔹 Example Snippet:

class BankAccount:
    def __init__(self, balance):
        self.__balance = balance

    def get_balance(self):
        return self.__balance

    def set_balance(self, amount):
        if amount >= 0:
            self.__balance = amount

account = BankAccount(5000)
account.set_balance(7000)
print(account.get_balance())

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Assignment 12: Demonstrating Polymorphism with Methods

🔹 Task: Define two classes with the same method name but different implementations. 🔹 Example Snippet:

class Cat:
    def speak(self):
        print("Meow")

class Dog:
    def speak(self):
        print("Bark")

def make_animal_speak(animal):
    animal.speak()

cat = Cat()
dog = Dog()

make_animal_speak(cat)
make_animal_speak(dog)

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3️⃣ Magic Methods (str, repr, call) (4 Assignments)

Assignment 13: Using __str__ Method

🔹 Task: Define a class with __str__ for readable output. 🔹 Example Snippet:

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __str__(self):
        return f"{self.name} is {self.age} years old"

person = Person("John", 30)
print(person)

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Assignment 14: Using __repr__ Method

🔹 Task: Define a class with __repr__ for debugging output. 🔹 Example Snippet:

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __repr__(self):
        return f"Person('{self.name}', {self.age})"

person = Person("Alice", 25)
print(repr(person))

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Assignment 15: Using __call__ Method

🔹 Task: Make a class instance callable like a function. 🔹 Example Snippet:

class Calculator:
    def __call__(self, a, b):
        return a + b

calc = Calculator()
print(calc(10, 5))

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4️⃣ Monkey Patching (4 Assignments)

Assignment 16: Modifying a Class Method Dynamically

🔹 Task: Change a class method at runtime. 🔹 Example Snippet:

class Person:
    def greet(self):
        print("Hello!")

def new_greet():
    print("Hey there!")

Person.greet = new_greet
p = Person()
p.greet()

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Assignment 17: Monkey Patching an Imported Module Function

🔹 Task: Change time.sleep behavior. 🔹 Example Snippet:

import time

def fast_sleep(seconds):
    print(f"Skipping sleep for {seconds} seconds")

time.sleep = fast_sleep
time.sleep(5)

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