#3 – Object-Oriented Programming (OOP)

Question 1

How do you define a basic class in Python?

Answer 1

Use the class keyword.

class Dog:     
def \_\_init\_\_(self, name):         
self.name = name

Question 2

How do you create an instance of a class?

Answer 2

Call the class like a function.

dog = Dog('Fido')

Question 3

What is \_\_init\_\_ used for in a class?

Answer 3

It is a constructor method that runs when an object is created.

class Cat:     def \_\_init\_\_(self, age):         self.age = age

Question 4

What does self mean in a class?

Answer 4

self refers to the instance of the class, allowing access to its attributes and methods.

Question 5

How do you define a method inside a class?

Answer 5

Define a function with self as the first parameter.

class A:     def say_hi(self):         print('Hi')

Question 6

What is a dunder method in Python?

Answer 6

A ‘dunder’ method has double underscores (__) before and after. They’re special methods used by Python internally.

Question 7

What is \_\_str\_\_ used for?

Answer 7

To define what should be returned when str(object) or print(object) is called.

def \_\_str\_\_(self): return f'My name is {self.name}'

Question 8

What is \_\_repr\_\_ used for?

Answer 8

To return an official string representation for developers.

def \_\_repr\_\_(self): return f'Dog(name={self.name})'

Question 9

What is inheritance in Python?

Answer 9

A class can inherit from another to reuse its code.

class Puppy(Dog):     def bark(self):         print('woof')

Question 10

How do you call a method from the parent class?

Answer 10

Use super().

class Puppy(Dog):     def \_\_init\_\_(self, name):         super().\_\_init\_\_(name)