Python Coding challenge - Day 984| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class A:

A class named A is defined.

2. Defining Method f

    def f(self):

        A.f = lambda self: "X"

        return "A"

This method does two things:

Reassigns the class method A.f

It replaces A.f with a new lambda function:

lambda self: "X"

Returns "A" for the current call.

Important:

This reassignment happens during the execution of the method.

3. Creating an Instance

a = A()

An object a of class A is created.

At this point:

A.f → original method (returns "A")

4. First Call: a.f()

a.f()

Step-by-step:

Python finds method f on class A.

Executes the original method.

Inside the method:

A.f is replaced with the lambda returning "X".

The method returns "A".

Result of first call:

"A"

5. Second Call: a.f()

a.f()

Step-by-step:

Python again looks for f on class A.

Now A.f is the new lambda function.

The lambda runs and returns "X".

Result of second call:

"X"

6. Printing Both Results

print(a.f(), a.f())

First a.f() → "A"

Second a.f() → "X"

7. Final Output

A X

Final Answer

✔ Output:

A X

400 Days Python Coding Challenges with Explanation