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Python language

Coroutine

A function defined with async def. Calling it returns a coroutine object; nothing runs until it is awaited or scheduled.

Why interviewers ask about it

The common bug is forgetting to await, which produces a 'coroutine was never awaited' warning and silently does nothing.

Related terms

asyncio event loop

The single-threaded scheduler running coroutines, resuming each when the thing it awaited is ready.

Generator

A function using yield, producing values lazily and holding its state between calls.

This term is part of the free Python Full-Stack interview preparation module - browse the full glossary for every definition.