Python Coding challenge - Day 976| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class A:

    def f(self):

        return "A"

A class A is defined.

It has an instance method f that returns "A".

At this moment:

A.f → method that returns "A"

2. Creating an Instance

a = A()

An object a of class A is created.

a does not store method f inside itself.

Methods are looked up on the class, not copied into the object.

3. Replacing the Method on the Class

A.f = lambda self: "X"

The method f on class A is reassigned.

The original method is replaced by a lambda function that returns "X".

Now:

A.f → lambda self: "X"

This affects all instances, including ones created earlier.

4. Calling the Method on the Existing Instance

print(a.f())

Step-by-step:

Python looks for f on the instance a → not found.

Python looks for f on the class A → finds the new lambda.

The lambda is called with self = a.

It returns "X".

5. Final Output

X

Final Answer

✔ Output:

X

900 Days Python Coding Challenges with Explanation