Python Coding challenge - Day 996| What is the output of the following Python Code?

 

Code Explanation:

1. Class Definition

class Tracker:

This line defines a class named Tracker.

It is used to track how many times objects are called.

2. Class Variable

    count = 0

count is a class variable, not an instance variable.

It is shared by all objects of the Tracker class.

Initial value of count is 0.

3. Callable Method (__call__)

    def __call__(self):

__call__ allows objects of this class to be called like a function.

Example: a() or b().

        Tracker.count += 1

Increases the class variable count by 1.

Since it belongs to the class, all objects see the same updated value.

        return Tracker.count

Returns the updated value of count.

4. Object Creation

a = Tracker()

b = Tracker()

Two separate objects a and b are created.

Both share the same class variable count.

5. First Call

a()

Tracker.count changes from 0 → 1

Returns 1

6. Second Call

b()

Tracker.count changes from 1 → 2

Returns 2

Even though b is a different object, it uses the same count.

7. Third Call

a()

Tracker.count changes from 2 → 3

Returns 3

8. Print Statement

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

Prints the returned values in order:

1 2 3

100 Python Programs for Beginner with explanation