Python Coding challenge - Day 1030| What is the output of the following Python Code?

 

Code Explanation: 

1️⃣ Class Definition

class Tool:

Defines a class named Tool.

A class is a blueprint for creating objects.

2️⃣ Method Definition

    def run(self):

        return "old"

Defines an instance method called run.

self refers to the object that calls the method.

When called normally, run() returns the string "old".

3️⃣ Object Creation

t = Tool()

Creates an object t of the class Tool.

At this moment, t.run() would return "old".

4️⃣ Modifying the Class Method at Runtime

Tool.run = lambda self: "new"

This replaces the run method in the Tool class.

lambda self: "new" is an anonymous function that:

Takes self

Returns "new"

Since methods are looked up on the class, all instances of Tool

now use this new version of run.

⚠️ This change affects:

Existing objects (t)

Future objects created from Tool

5️⃣ Calling the Method

print(t.run())

What happens internally:

Python looks for run on object t

Doesn’t find it on the instance

Finds run on the class Tool

Binds self to t

Executes the lambda function

Returns "new"

✅ Final Output

new

500 Days Python Coding Challenges with Explanation