Asyncio Concurrency Patterns

If you're building anything I/O-bound in Python, this is the reference you want. It covers the full asyncio toolkit: event loops, coroutines, tasks, and all the synchronization primitives like semaphores and locks. The pattern catalog is the real value here. It shows you gather for concurrent execution, wait strategies for flexible control, semaphores for rate limiting, and queue-based producer/consumer setups. Each pattern includes actual code and explains when to use it. The skill assumes you know Python but walks through the cooperative multitasking model clearly. Good for API clients, websocket servers, background job processors, anything where you need to coordinate hundreds of concurrent operations without threading overhead.