Python Coding challenge - Day 970| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Base Class

class Base:

A class named Base is defined.

It will control behavior of all its subclasses.

2. Overriding __init_subclass__

    def __init_subclass__(cls):

        cls.run = lambda self: cls.__name__

__init_subclass__ is called automatically whenever a subclass is created.

cls refers to the newly created subclass.

This line injects a new method run into the subclass.

run returns the subclass's class name (cls.__name__).

So every subclass of Base automatically gets a run() method.

3. Creating Subclass A

class A(Base): pass

A is created as a subclass of Base.

This triggers:

Base.__init_subclass__(A)

So A.run = lambda self: "A"

4. Creating Subclass B

class B(A): pass

B is created as a subclass of A.

Since A inherited __init_subclass__ from Base, it is called for B too:

Base.__init_subclass__(B)

So B.run = lambda self: "B"

5. Calling the Methods

print(A().run(), B().run())

Step-by-step:

A().run() returns "A".

B().run() returns "B".

print prints both.

6. Final Output

A B

Final Answer

✔ Output:

A B

400 Days Python Coding Challenges with Explanation