Python Coding challenge - Day 1042| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class A:

Creates a class named A

By default, it inherits from object

🔹 2. Defining a Class Variable

count = 0

count is a class variable

It belongs to the class A, not to any specific object

Initially, there is one shared count for all instances

🔹 3. Defining the __call__ Method

def __call__(self):

__call__ is a magic method

It allows objects of class A to be called like functions

When you write a(), Python internally calls:

a.__call__()

🔹 4. Incrementing count Using self

self.count += 1

This line is the key trick.

What really happens:

Python looks for count on the instance self

self.count does not exist yet

Python then finds count in the class (A.count)

It reads the value 0, adds 1, and creates a new instance variable

self.count = 1

📌 From now on, this object has its own count, separate from the class.

🔹 5. Returning the Updated Value

return self.count

Returns the instance-level count

Each object now maintains its own counter

🔹 6. Creating the First Object

a = A()

Creates an instance a

No instance variable count yet

🔹 7. Creating the Second Object

b = A()

Creates another instance b

Independent from a

🔹 8. Calling the Objects

print(a(), b(), a())

Step-by-step execution:

a()

Uses class count = 0

Creates a.count = 1

Returns 1

b()

Uses class count = 0

Creates b.count = 1

Returns 1

a()

Uses instance variable a.count = 1

Increments to 2

Returns 2

✅ Final Output

1 1 2