Python Coding challenge - Day 939| What is the output of the following Python Code?

 

Code Explanation:

1. Defining a Custom Metaclass

class Meta(type):

A class named Meta is defined.

It inherits from type, which means Meta is a metaclass.

A metaclass controls how classes themselves are created.

2. Overriding the Metaclass __new__ Method

    def __new__(cls, name, bases, dct):

        print("Creating", name)

        return super().__new__(cls, name, bases, dct)

__new__ is called when a new class object is being created.

Parameters:

cls → the metaclass (Meta)

name → name of the class being created ("A", "B")

bases → parent classes

dct → dictionary containing class attributes/methods

This prints:

Creating <ClassName>

Then it delegates actual class creation to type.__new__.

3. Creating Class A Using the Metaclass

class A(metaclass=Meta):

    pass

What happens internally:

Python sees metaclass=Meta

Calls:

Meta.__new__(Meta, "A", (), class_dict)

__new__ prints:

Creating A

Class A is created.

4. Creating Subclass B of A

class B(A):

    pass

A uses metaclass Meta, so B automatically also uses Meta.

Python again calls:

Meta.__new__(Meta, "B", (A,), class_dict)

This prints:

Creating B

5. Final Output

Creating A

Creating B

Final Answer

✔ Output:

Creating A

Creating B

500 Days Python Coding Challenges with Explanation