What is a generator?
PICTURE THIS: HOW TO EXPLAIN IT
Simple meaning
A generator is an iterator produced by a function that uses yield, or by a generator expression.
WHY — Generators instead of guessing?
Why interviewers care about Generators:
who only read docs from people who shipped.
and tied to Python work.
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:
- 1A generator is an
iterator produced by a function that uses yield, or by a generator expression.
- 2It computes values lazily
and keeps little state between next() calls.
- 3That makes it ideal
for large streams you do not want to materialize as a list.
- 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
A generator is an iterator produced by a function that uses yield, or by a generator expression. It computes values lazily and keeps little state between next() calls.