Python asyncio provides cooperative concurrency for I/O-bound workloads. Event loops manage concurrent tasks. async/await syntax makes asynchronous code readable. Understanding patterns enables effective async applications.
Core Concepts
Coroutines defined with async def run concurrently. await suspends execution until results are ready. Event loops schedule and run coroutines. Tasks wrap coroutines for concurrent execution.
- Use async def to define coroutines
- await I/O operations to enable concurrency
- Create tasks with asyncio.create_task for concurrent work
- Use asyncio.gather to run multiple coroutines concurrently
- Handle exceptions with try/except in async code
Common Patterns
Async context managers manage async resources. Async iterators enable streaming data processing. Semaphores limit concurrent operations. Queue enables producer-consumer patterns.