Python Coding challenge - Day 979| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Descriptor Class

class D:

D is a descriptor class because it defines the __get__ method.

Descriptors control how attributes are accessed.

2. Implementing the __get__ Method

    def __get__(self, obj, owner):

        return "descriptor"

__get__ is called whenever the managed attribute is accessed.

Parameters:

self → the descriptor object

obj → the instance accessing the attribute

owner → the owner class (A)

It always returns the string "descriptor".

 3. Defining the Owner Class

class A:

    x = D()

The attribute x of class A is assigned a D object.

This makes x a managed attribute controlled by the descriptor.

4. Creating an Instance

a = A()

An object a of class A is created.

Initially, a has no attribute x in its instance dictionary.

5. Assigning to the Instance Attribute

a.x = "instance"

This creates an entry {"x": "instance"} in a.__dict__.

However, this does not override the descriptor when accessing x.

 6. Accessing the Attribute

print(a.x)

Step-by-step attribute lookup:

Python checks if x is a data descriptor on the class.

D defines __get__ → it is a descriptor.

Descriptors take priority over instance attributes.

D.__get__ is called.

"descriptor" is returned.

7. Final Output

descriptor

Final Answer

✔ Output:

descriptor

900 Days Python Coding Challenges with Explanation