Python Coding challenge - Day 1150| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Class Definition

class Test:

✅ Explanation:

A class named Test is created.

Inside this class:

A decorator function deco is defined

A method show is defined

🔹 2. Decorator Function Definition

def deco(func):

✅ Explanation:

deco is a decorator function.

It takes another function (func) as argument.

🔍 In this code:

func will be:

show()

🔹 3. Wrapper Function Inside Decorator

def wrapper(self):

✅ Explanation:

wrapper is a new function created inside decorator.

This function will replace original show() method.

self refers to current object (obj).

🔹 4. Modified Return Statement

return "Hello " + func(self)

✅ Explanation:

Calls original function:

func(self)

🔍 Original show() returns:

"World"

So final result becomes:

"Hello World"

🔹 5. Returning Wrapper

return wrapper

✅ Explanation:

Decorator returns wrapper.

So original function is replaced by wrapper function.

🔹 6. Applying Decorator

@deco

✅ Explanation:

This line means:

show = deco(show)

🔍 What happens:

Original show() is passed into deco

deco returns wrapper

show now points to wrapper

🔹 7. Original Method

def show(self):

    return "World"

✅ Explanation:

Original method simply returns:

"World"

But because of decorator,

this method is wrapped inside wrapper.

🔹 8. Object Creation

obj = Test()

✅ Explanation:

Creates object obj of class Test.

🔹 9. Calling Method

print(obj.show())

🔍 What happens internally:

Because of decorator:

obj.show()

actually becomes:

wrapper(obj)

🔹 10. Execution Inside Wrapper

Step 1:

func(self)

calls original:

show(obj)

returns:

"World"

Step 2:

Wrapper adds:

"Hello " + "World"

Result:

"Hello World"

🎯 Final Output

Hello World

Book:  700 Days Python Coding Challenges with Explanation