🎯 Python Quick Quiz – OOP Edition
💡 _What is the primary use of the __init__ method in a Python class?_

🔘 Option 1: Initializing class attributes ✅
🔘 Option 2: Defining class methods
🔘 Option 3: Inheriting from a superclass
🔘 Option 4: Handling exceptions

🧠 Correct Answer: Option 1
📌 The init method is a special method used to initialize the object’s attributes when a class is instantiated. It's like a constructor in other programming languages.

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

john = Person("John", 25)
print(john.name)  # Output: John

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🔄 How to define a class variable shared among all instances of a class in Python?

In Python, if you want to define a variable that is shared across all instances of a class, you should define it outside of any method but inside the class — this is called a class variable.

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✅ Correct answer to the question:

> How would you define a class variable that is shared among all instances of a class in Python?

🟢 Option 2: Outside of any method at the class level

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🔍 Let’s review the other options:

🔴 Option 1: Inside the constructor method using self
This creates an instance variable, specific to each object, not shared.

🔴 Option 3: As a local variable inside a method
Local variables are temporary and only exist inside the method scope.

🔴 Option 4: As a global variable outside the class
Global variables are shared across the entire program, not specific to class instances.

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🚗 Simple Example: Class Variable in Action

class Car:
    wheels = 4  # ✅ class variable, shared across all instances

    def __init__(self, brand, color):
        self.brand = brand  # instance variable
        self.color = color  # instance variable

car1 = Car("Toyota", "Red")
car2 = Car("BMW", "Blue")

print(Car.wheels)   # Output: 4
print(car1.wheels)  # Output: 4
print(car2.wheels)  # Output: 4

Car.wheels = 6  # changing the class variable

print(car1.wheels)  # Output: 6
print(car2.wheels)  # Output: 6

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💡 Key Takeaways:
- self. creates instance variables → unique to each object.
- Class-level variables (outside methods) are shared across all instances.
- Perfect for shared attributes like constants, counters, or shared settings.



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👨‍💻 From: https://t.iss.one/DataScienceQ