Python Coding challenge - Day 923| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Descriptor Class

class Desc:

A new class named Desc is created.

This class will act as a descriptor, meaning it controls attribute access.

2. Implementing the __get__ Method

    def __get__(self, obj, owner):

        return 100

__get__ is a special descriptor method.

It is called whenever the attribute (to which this descriptor is attached) is read or accessed.

Parameters:

obj → the instance of the class accessing the attribute (e.g., d)

owner → the class in which the descriptor is defined (e.g., Demo)

It returns the fixed value 100 every time.

That means no value is stored — the result is always computed/returned dynamically.

3. Creating a Second Class That Uses the Descriptor

class Demo:

    x = Desc()

A class named Demo is created.

Inside it, the class attribute x is assigned an instance of Desc.

This means:

Attribute x is controlled by the descriptor.

From now on, whenever x is accessed through an object of Demo, Python will call Desc.__get__.

4. Creating an Object of Demo

d = Demo()

An object d of the class Demo is created.

It does not store any value in d.x directly — because x is not a normal attribute.

5. Accessing the Descriptor Attribute

print(d.x)

Here is what Python does behind the scenes:

It sees d.x

Python notices that x is a descriptor

So it calls:

Desc.__get__(<Desc instance>, d, Demo)

__get__ returns 100

So the printed result is:

100

Final Output

Output:

100

400 Days Python Coding Challenges with Explanation