Python Coding challenge - Day 1074| What is the output of the following Python Code?

 

Code Esxplanation:

1. Defining Class A

class A:

Explanation:

This line creates a class named A.

A class is a blueprint used to create objects (instances).

2. Defining Method f

def f(self):

    return "A"

Explanation:

A method f is defined inside class A.

self refers to the instance (object) of the class.

The method returns the string "A".

So initially:

A.f() → returns "A"

3. Creating an Object

a = A()

Explanation:

This creates an object a of class A.

The object a can access the method f.

Example:

a.f() → "A"

4. Replacing the Method f

A.f = lambda self: "B"

Explanation:

This line replaces the method f of class A.

A lambda function is assigned to A.f.

Lambda function:

lambda self: "B"

means:

It takes self as an argument.

It returns "B".

Now the original method is overwritten.

So now:

A.f() → returns "B"

5. Calling the Method

print(a.f())

Explanation:

The object a looks for method f.

Python finds f in the class A.

Since we replaced it with the lambda function, Python executes:

lambda self: "B"

with self = a.

So it returns:

"B"

6. Final Output

B

Key Concept

Methods Can Be Changed Dynamically

In Python, class methods can be modified after class creation.

Flow in this code:

Original method: f() → "A"

↓

A.f replaced by lambda

↓

New method: f() → "B"

✅ Final Output

B

900 Days Python Coding Challenges with Explanation