What does async def mean?
PICTURE THIS: 1, 2, 2, 8
Mean3.25average
Median2middle
Mode2most often
Simple meaning
async def defines a coroutine function.
WHY — asyncio instead of guessing?
Why interviewers care about asyncio:
asyncio questions separate people
who only read docs from people who shipped.
Keep it short, concrete,
and tied to Python work.
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:
- 1async def defines a
coroutine function.
- 2Calling it returns a
coroutine object
- 3it does not run
until you await it or schedule it on the loop.
- 4Mixing blocking ORM calls
inside async def without sync_to_async will stall the loop.
- 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:
Say this line
“Calling it returns a coroutine object”
Break into beats
Callingitreturnsacoroutineobject
Speaking order
2987408337471632900
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
async def defines a coroutine function. Calling it returns a coroutine object