Moderate Decorators Question 80 of 228

How can a class act as a decorator?

Python & Django · Speak this in 60–90 seconds · Faridabad & Delhi NCR

PICTURE THIS: HOW TO EXPLAIN IT

IdeaDecorators

HowWhat happens inside

Why they askShows real use

Simple meaning

If a class implements __init__ to receive the function and __call__ to run the wrapper, instances are callable decorators.

WHY — Decorators instead of guessing?

Why interviewers care about Decorators:

This is a process

question about Decorators.

Panels listen for order,

trade-offs, and what you would actually do on a Python project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

STEPS — What happens step by step?

Before you speak the answer, walk the interviewer through these steps:

1
If a class implements
__init__ to receive the function and __call__ to run the wrapper, instances are callable decorators.
2
@MyDec is equivalent to
func = MyDec(func).
3
This style is handy
when the decorator must hold state across calls.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

EXAMPLE — See it in action

Here's a short line you can speak, broken into clear beats:

Say this line

“@MyDec is equivalent to func = MyDec(func).”

Break into beats

MyDecisequivalenttofuncMyDec

Speaking order

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Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Key takeaway

If a class implements __init__ to receive the function and __call__ to run the wrapper, instances are callable decorators. @MyDec is equivalent to func = MyDec(func).