Python Coding challenge - Day 927| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Descriptor Class

class Desc:

A class named Desc is created.

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

2. Implementing the __get__ Method

    def __get__(self, obj, owner):

        return 99

__get__ is a special method used by descriptors.

It is called automatically whenever the attribute it controls is read/accessed.

Parameters:

self → the descriptor object

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

owner → the class of the instance (e.g., Demo)

The method simply returns 99, regardless of object or class.

3. Defining a Class that Uses the Descriptor

class Demo:

    x = Desc()

A class named Demo is defined.

The class attribute x is assigned an instance of Desc.

This makes x a managed attribute controlled by the descriptor.

Any access to x will go through Desc.__get__.

4. Creating an Instance of Demo

d = Demo()

An object d of class Demo is created.

It does not store a normal value for x; access is handled by the descriptor.

5. Accessing the Descriptor Attribute

print(d.x)

Here’s what Python does internally:

It sees d.x.

It finds that x is a descriptor.

It calls:

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

__get__ returns 99.

print prints that value.

6. Final Output

99

700 Days Python Coding Challenges with Explanation