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

 

Code Explanation:

🔹 1. Class Definition

class Test:

✅ Explanation:

A class Test is created.

Inside it:

A decorator method is defined

A normal 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 case:

func will become:

show()

🔹 3. Wrapper Function

def wrapper(self):

✅ Explanation:

wrapper is the new function that replaces original show()

self refers to current object (obj)

🔹 4. Returning Modified Output

return "Hello " + func(self)

✅ Explanation:

Calls original function:

func(self)

which is:

show(self)

🔍 Original function returns:

"World"

So final result becomes:

"Hello World"

🔹 5. Returning Wrapper

return wrapper

✅ Explanation:

deco() returns wrapper

So original method show() gets replaced by wrapper

🔹 6. Applying Decorator

@deco

✅ Explanation:

This line means:

show = deco(show)

🔍 So:

Original show() is passed into deco

Returned wrapper becomes new show

🔹 7. Original Method

def show(self):

    return "World"

✅ Explanation:

Original method simply returns:

"World"

🔹 8. Object Creation

obj = Test()

✅ Explanation:

Creates object obj of class Test

🔹 9. Calling Decorated Method

print(obj.show())

🔍 What happens internally:

Since decorator replaced method:

obj.show()

actually calls:

wrapper(obj)

Step-by-step Execution:

➤ Inside wrapper:

func(self)

calls original:

show(obj)

returns:

"World"

➤ Final result:

"Hello " + "World"

becomes:

"Hello World"

🎯 Final Output

Hello World

Book: 900 Days Python Coding Challenges with Explanation