From 61379dcf808869dcd9524a4bf0b66d53034288d5 Mon Sep 17 00:00:00 2001 From: Sai Mahesh sandeboina Date: Wed, 14 Jan 2026 22:33:30 -0500 Subject: [PATCH] Docs: clarify when to use async def vs def --- docs/en/docs/async.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/docs/en/docs/async.md b/docs/en/docs/async.md index eac473bde4..79996d92c7 100644 --- a/docs/en/docs/async.md +++ b/docs/en/docs/async.md @@ -349,6 +349,10 @@ async def read_burgers(): return burgers ``` +**Clarification on `async def` usage** + +Using `async def` is beneficial only when the function performs asynchronous I/O operations, such as awaiting database calls, HTTP requests, or other non-blocking tasks. If a path operation function contains only blocking or CPU-bound code, defining it with `async def` does not provide performance benefits and may add unnecessary complexity. In those cases, using a regular `def` function is recommended. + ### More technical details { #more-technical-details } You might have noticed that `await` can only be used inside of functions defined with `async def`.