Python Coding challenge - Day 847| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class A:

Creates a class named A.

A class acts as a blueprint for creating objects (instances).

2. Declaring a Class Variable

count = 0

count is a class variable, shared across all instances of class A.

Initially, A.count = 0.

3. Defining the Constructor

def __init__(self):

    A.count += 1

__init__ is the constructor, executed automatically when an object is created.

Each time a new object is created, A.count increases by 1.

This tracks how many objects have been created.

4. Loop to Create Objects

for i in range(3):

    a = A()

The loop runs 3 times (i = 0, 1, 2).

Each iteration creates a new object of class A, calling the constructor.

After each iteration, A.count increases:

Iteration Action A.count

1 new A() 1

2 new A() 2

3 new A() 3

Variable a always refers to the last object created.

5. Printing the Class Variable

print(A.count)

Accesses the class variable count directly through the class A.

Since 3 objects were created, A.count = 3.

Prints 3.

Final Output

3

600 Days Python Coding Challenges with Explanation