Python Coding challenge - Day 1082| What is the output of the following Python Code?

 

Code Explanation:

🔹 1️⃣ Defining Descriptor Class D

class D:

A new class D is created.

This class will act as a descriptor because it defines the method __get__.

🔹 2️⃣ Defining the __get__ Method

def __get__(self, obj, objtype):

    return 50

This method is automatically called when the attribute is accessed.

Parameters:

self → the descriptor object

obj → the instance accessing the attribute (a)

objtype → the class of the instance (A)

In this code:

return 50

So whenever the attribute is accessed, 50 will be returned.

🔹 3️⃣ Defining Class A

class A:

A new class A is created.

🔹 4️⃣ Assigning Descriptor to Class Attribute

x = D()

Here an instance of class D is assigned to the class variable x.

So internally:

A.x → descriptor object

This means x is now controlled by the descriptor D.

🔹 5️⃣ Creating an Object of Class A

a = A()

An instance a of class A is created.

At this moment:

a.__dict__ = {}

No instance attributes exist yet.

🔹 6️⃣ Accessing a.x

print(a.x)

Python performs attribute lookup.

Steps:

Step 1

Check instance dictionary

a.__dict__

No x found.

Step 2

Check class attributes

A.x

Found → descriptor object D.

Step 3

Since it is a descriptor, Python calls:

D.__get__(descriptor, a, A)

Inside the method:

return 50

✅ Final Output

50

500 Days Python Coding Challenges with Explanation