Python Coding challenge - Day 1106| What is the output of the following Python Code?

 

Code Explanation:

1️⃣ Defining Descriptor Class

class Descriptor:

Explanation

A class named Descriptor is created.

This class implements the descriptor protocol.

Descriptors control attribute access in Python.

2️⃣ Defining __get__ Method

def __get__(self, obj, objtype):

Explanation

Called when the attribute is accessed (e.g., a.x).

Parameters:

self → descriptor instance

obj → object (a)

objtype → class (A)

3️⃣ Returning Value in __get__

return obj._x

Explanation

Returns the value stored in _x inside the object.

_x is a hidden/internal attribute.

4️⃣ Defining __set__ Method

def __set__(self, obj, value):

Explanation

Called when assigning value to attribute (a.x = value).

Controls how value is stored.

5️⃣ Modifying Value Before Storing

obj._x = value * 2

Explanation

Multiplies value by 2 before storing.

Stores result in obj._x.

👉 So:

a.x = 5

becomes:

obj._x = 10

6️⃣ Defining Class Using Descriptor

class A:

Explanation

A class A is created.

7️⃣ Assigning Descriptor to Attribute

x = Descriptor()

Explanation

x is not a normal variable.

It is a descriptor object.

So x is controlled by __get__ and __set__.

8️⃣ Creating Object

a = A()

Explanation

Creates an instance a of class A.

9️⃣ Setting Value

a.x = 5

Explanation

Calls:

Descriptor.__set__(a, 5)

Stores:

a._x = 10

🔟 Getting Value

print(a.x)

Explanation

Calls:

Descriptor.__get__(a, A)

Returns:

a._x → 10

📤 Final Output

10

Book:  500 Days Python Coding Challenges with Explanation