Hackerrank Object-Oriented Programming Basics 3

Question 1

How do you define a class method (not an instance method) in Python?

Accepted Answer

Use @classmethod decorator with 'cls' as first parameter

Answer

Use @staticmethod decorator with 'cls' as first parameter

Answer

Use @classmethod decorator with 'self' as first parameter

Answer

Define the method outside the class body

Question 2

What is method overriding in Python?

Accepted Answer

A child class provides its own implementation of a method inherited from the parent

Answer

Defining multiple methods with the same name but different parameter counts

Answer

Deleting a method from the parent class

Answer

Adding parameters to a method at runtime

Question 3

What is the output of:
class A:
    x = 10
a1 = A()
A.x = 20
print(a1.x)

Accepted Answer

20

Answer

10

Answer

None

Answer

AttributeError

Question 4

Which statement about Python's __str__ method is correct?

Accepted Answer

It is called by str() and print() to get a human-readable string

Answer

It returns an integer representation of the object

Answer

It compares two objects for equality

Answer

It returns the memory address of the object

Question 5

What does super() do in a subclass?

Accepted Answer

Returns a proxy that delegates method calls to the parent class

Answer

Creates a new instance of the parent class

Answer

Deletes the child class and keeps only the parent

Answer

Copies all parent attributes to the child instance

Question 6

How do you create a static method in Python?

Accepted Answer

Use the @staticmethod decorator and no 'self' or 'cls' parameter

Answer

Use the keyword 'static' before 'def'

Answer

Use the @classmethod decorator without parameters

Answer

Define the method outside the class

Question 7

What is multiple inheritance in Python?

Accepted Answer

A class derives from more than one parent class

Answer

A class can have multiple __init__ methods

Answer

An instance can belong to multiple classes simultaneously

Answer

A method is defined multiple times in the same class