Python Coding challenge - Day 981| What is the output of the following Python Code?

 

Code Explanation:

1. Defining a Descriptor Class D

class D:

This defines a class named D.

It is intended to be used as a descriptor.

2. Implementing the __get__ Method

    def __get__(self, obj, owner):

        return 50

__get__ is a descriptor method.

It is automatically called when the attribute is accessed.

Parameters:

self → the descriptor object (D instance)

obj → the instance accessing the attribute (a)

owner → the class owning the attribute (A)

It always returns 50, regardless of the object or class.

3. Defining Class A

class A:

This defines a class named A.

4. Creating a Descriptor Attribute in Class A

    x = D()

x is a class attribute.

It is assigned an instance of D.

Because D defines __get__, x becomes a non-data descriptor

(it has __get__ but no __set__).

5. Creating an Object of Class A

a = A()

An instance a of class A is created.

6. Assigning a Value to a.x

a.x = 10

This creates an instance attribute x in object a.

Since D does not define __set__, it is a non-data descriptor.

Instance attributes override non-data descriptors.

So now:

a.__dict__ = {'x': 10}

7. Accessing a.x

print(a.x)

Python looks for x in the following order:

Instance dictionary (a.__dict__)

Class attributes / descriptors

Since a.__dict__['x'] exists, it is returned.

The descriptor’s __get__ method is not called.

8. Final Output

10

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