How do == and is differ when comparing objects?
PICTURE THIS: PYTHON TYPES
Simple meaning
The == operator calls equality logic, usually __eq__, and compares values.
WHY — Data Types instead of guessing?
Why interviewers care about Data Types:
question about Data Types.
trade-offs, and what you would actually do on a Python project - not buzzwords.
Name the idea, why it exists, then one short example.
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:
- 1The == operator calls
equality logic, usually __eq__, and compares values.
- 2The is operator tests
identity: whether two names point to the same object in memory.
- 3Use is for None
and singletons, and == for numbers, strings, and containers.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
The == operator calls equality logic, usually __eq__, and compares values. The is operator tests identity: whether two names point to the same object in memory.