Python Coding challenge - Day 966| What is the output of the following Python Code?

 

Code Explanation:

1. Defining a Custom Metaclass

class Meta(type):

Meta is a metaclass because it inherits from type.

A metaclass controls how classes are created.

2. Overriding the Metaclass __new__ Method

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

        dct["version"] = "1.0"

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

__new__ runs when a class using this metaclass is created.

Parameters:

cls → the metaclass (Meta)

name → name of the class being created ("App")

bases → base classes

dct → dictionary of class attributes

What it does:

Adds a new attribute version with value "1.0" into the class dictionary.

Then creates the class normally.

So every class created with Meta automatically has version = "1.0".

3. Creating Class App Using the Metaclass

class App(metaclass=Meta): pass

App is created using Meta.

During creation:

Python calls Meta.__new__(Meta, "App", (), {}).

version = "1.0" is injected.

The App class is created.

So now:

App.version == "1.0"

4. Accessing the Injected Attribute

print(App.version)

Reads the version attribute from the class App.

5. Final Output

1.0

Final Answer

✔ Output:

1.0

400 Days Python Coding Challenges with Explanation