hardDSA

What is __init_subclass__ in Python?

Q: What is __init_subclass__ in Python?

__init_subclass__ is a classmethod hook that runs whenever a subclass is defined, letting a base class validate or register subclasses without a metaclass.

223 views

Understand the problem

Hook for subclass creation.

oopinit-subclass

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

Study the solution

init_subclass is a classmethod hook that runs whenever a subclass is defined, letting a base class validate or register subclasses without a metaclass.

Solution ready — 2 min read

Classified // press E to declassify

Run the code

PYAuto-register and validate subclasses

Practice

Join the discussion

Discussion (0)

No responses yet. Be the first to share what you think.

Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 114 of 120 decoded in the Python track. One more won't hurt.

Back to track

Next up→

What is the difference between del, __del__, and garbage collection?

Continue