Async Python (Complete)
Complete async Python guide: event loops, coroutines, task groups, semaphores, and production async patterns.
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Async Python — Complete FDE Guide
Async is essential for agents: parallel tool calls, streaming responses, and concurrent request handling.
The mental model
Sync: "I'll wait here until the API responds. Nothing else can happen." Async: "I'll start the API call, go do other work, and come back when the response arrives." Async doesn't make one call faster — it lets you do many things at once while waiting for I/O.