Python Coding challenge - Day 973| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Vanish Descriptor Class

class Vanish:

This defines a class named Vanish.

It is intended to be used as a descriptor.

2. Defining the __get__ Method

    def __get__(self, obj, owner):

__get__ makes Vanish a descriptor.

It is automatically called when the attribute is accessed.

Parameters:

self → the Vanish instance

obj → the instance accessing the attribute (a)

owner → the class owning the attribute (A)

3. Deleting the Attribute from the Class

        del owner.x

This line removes x from the class A.

After this executes:

A.x no longer exists.

This deletion happens during attribute access, not at class creation.

4. Returning a Value

        return 100

After deleting x, the descriptor returns 100.

This value becomes the result of a.x.

5. Defining Class A

class A:

This defines a class named A.

6. Assigning the Descriptor to x

    x = Vanish()

x is a class attribute.

Since Vanish defines __get__, x becomes a descriptor.

Any access to x triggers Vanish.__get__.

7. Creating an Instance of A

a = A()

An object a of class A is created.

No descriptor logic runs yet.

8. Accessing a.x

a.x

Python looks for x:

Finds x on class A

Sees it is a descriptor

Calls Vanish.__get__(self, a, A)

Inside __get__:

A.x is deleted

100 is returned

9. Checking if A Still Has Attribute x

hasattr(A, "x")

Since del owner.x removed x:

A no longer has attribute x

hasattr(A, "x") returns False

10. Printing the Results

print(a.x, hasattr(A, "x"))

Values:

a.x → 100

hasattr(A, "x") → False

11. Final Output

100 False

400 Days Python Coding Challenges with Explanation