python-async

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Consult this skill for async Python patterns and concurrency. Use when building async APIs, concurrent systems, I/O-bound applications, implementing rate limiting, async context managers. Do not use when CPU-bound optimization - use python-performance instead. DO NOT use when: testing async code - use python-testing async module.

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Sourceathola/claude-night-market

Added on2026-03-04

NPX Install

npx skill4agent add athola/claude-night-market python-async

SKILL.md Content

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Async Python Patterns

asyncio and async/await patterns for Python applications.

Quick Start

python

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()

loop.run_in_executor()

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

@pytest.mark.asyncio