Python Coding challenge - Day 907| What is the output of the following Python Code?

 

Code Explanation:

1. Class Definition

class Counter:

Explanation:

A class named Counter is created.

It will contain a method that keeps track of how many times it is called.

2. Method Definition

def count(self):

Explanation:

count() is an instance method.

self refers to the current object (c).

This method will be called multiple times.

3. Checking if Function Attribute Exists

if not hasattr(self.count, "n"):

Explanation:

self.count refers to the method object itself.

hasattr(self.count, "n") checks whether the method already has an attribute named n.

On the first call, n does NOT exist → condition is True.

4. Creating a Function Attribute

self.count.n = 0

Explanation:

A new attribute n is attached to the function object count.

This is not:

an instance variable

a class variable

It is a function (method) attribute.

5. Incrementing the Function Attribute

self.count.n += 1

Explanation:

Increases the value of n by 1.

Since n belongs to the method, its value is remembered between calls.

6. Returning the Value

return self.count.n

Explanation:

Returns the current value of the function attribute n.

7. Object Creation

c = Counter()

Explanation:

Creates an object c of class Counter.

8. First Method Call

c.count()

What happens:

n does NOT exist → set to 0

Increment → n = 1

Returns 1

9. Second Method Call

c.count()

What happens:

n already exists

Skip initialization

Increment → n = 2

Returns 2

10. Print Statement

print(c.count(), c.count())

Explanation:

First call prints 1

Second call prints 2

FINAL OUTPUT

1 2

700 Days Python Coding Challenges with Explanation