Async Python Patterns

asyncio and async/await patterns for Python applications.

Quick Start

import asyncio

async def main():
    print("Hello")
    await asyncio.sleep(1)
    print("World")

asyncio.run(main())

When To Use

• Building async web APIs (FastAPI, aiohttp)
• Implementing concurrent I/O operations
• Creating web scrapers with concurrent requests
• Developing real-time applications (WebSockets)
• Processing multiple independent tasks simultaneously
• Building microservices with async communication

When NOT To Use

• CPU-bound optimization - use python-performance instead
• Testing async code - use python-testing async module

Modules

This skill uses progressive loading. Content is organized into focused modules:

• See

  modules/basic-patterns.md

  - Core async/await, gather(), and task management
• See

  modules/concurrency-control.md

  - Semaphores and locks for rate limiting
• See

  modules/error-handling-timeouts.md

  - Error handling, timeouts, and cancellation
• See

  modules/advanced-patterns.md

  - Context managers, iterators, producer-consumer
• See

  modules/testing-async.md

  - Testing with pytest-asyncio
• See

  modules/real-world-applications.md

  - Web scraping and database operations
• See

  modules/pitfalls-best-practices.md

  - Common mistakes and best practices

Load specific modules based on your needs, or reference all for detailed guidance.

Exit Criteria

• Async patterns applied correctly
• No blocking operations in async code
• Proper error handling implemented
• Rate limiting configured where needed
• Tests pass with pytest-asyncio

Troubleshooting

Common Issues

RuntimeError: no current event loop Use

asyncio.run()

as the entry point. Avoid

get_event_loop()

in Python 3.10+.

Blocking call in async context Move sync I/O to

asyncio.to_thread()

or

loop.run_in_executor()

.

Tests hang indefinitely Ensure pytest-asyncio is installed and test functions are decorated with

@pytest.mark.asyncio

.