{"query": "python asyncio best practices", "source": "deep", "count": 8, "results": [{"index": 1, "title": "A Conceptual Overview of asyncio \u2014 Python 3.14.6 documentation", "url": "https://docs.python.org/3/howto/a-conceptual-overview-of-asyncio.html", "source": "brave", "grade": {"overall": 8.0, "relevance": 10, "depth": 6.7, "authority": 7.0, "freshness": 5.0, "word_count": 1331, "intent_hits": 8}, "query_origin": "asyncio<pad>"}, {"index": 2, "title": "Coroutines and tasks \u2014 Python 3.14.6 documentation", "url": "https://docs.python.org/3/library/asyncio-task.html", "source": "brave", "grade": {"overall": 7.9, "relevance": 10, "depth": 6.0, "authority": 7.0, "freshness": 5.0, "word_count": 1204, "intent_hits": 8}, "query_origin": "asyncio<pad>"}, {"index": 3, "title": "Developing with asyncio \u2014 Python 3.15.0b1 documentation", "url": "https://docs.python.org/3.15/library/asyncio-dev.html", "source": "duckduckgo_html", "grade": {"overall": 7.7, "relevance": 10, "depth": 5.0, "authority": 7.0, "freshness": 5.0, "word_count": 1010, "intent_hits": 8}, "query_origin": "python asyncio common mistakes and anti-patterns"}, {"index": 4, "title": "asyncio \u2014 asynchronous I/O scheduler \u2014 MicroPython latest documentation", "url": "https://docs.micropython.org/en/latest/library/asyncio.html", "source": "brave", "grade": {"overall": 7.6, "relevance": 10, "depth": 4.6, "authority": 7.0, "freshness": 5.0, "word_count": 925, "intent_hits": 8}, "query_origin": "asyncio<pad>"}, {"index": 5, "title": "Fixing asyncio concurrency with blocking I/O [Solved]", "url": "https://www.technetexperts.com/asyncio-blocking-call-concurrency-fix/", "source": "duckduckgo_html", "grade": {"overall": 7.6, "relevance": 10, "depth": 4.4, "authority": 5.0, "freshness": 8.0, "word_count": 880, "intent_hits": 8}, "query_origin": "how to prevent blocking the asyncio event loop"}, {"index": 6, "title": "Asynchronous Exception Handling in Python: A Practical Guide with ...", "url": "https://www.pythontutorials.net/blog/asynchronous-exception-handling-in-python/", "source": "duckduckgo_html", "grade": {"overall": 7.2, "relevance": 10, "depth": 4.7, "authority": 5.0, "freshness": 5.0, "word_count": 939, "intent_hits": 8}, "query_origin": "python asyncio best practices for error handling"}, {"index": 7, "title": "Advanced Asyncio Python: Real-World Patterns and Anti-Patterns", "url": "https://pythonz2h.com/chapter_09_concurrency_and_parallelism/series_03_advanced_asyncio_patterns/patterns_antipatterns", "source": "duckduckgo_html", "grade": {"overall": 7.1, "relevance": 10, "depth": 4.3, "authority": 5.0, "freshness": 5.0, "word_count": 861, "intent_hits": 8}, "query_origin": "python asyncio common mistakes and anti-patterns"}, {"index": 8, "title": "How to Handle Asyncio Task Exceptions - SuperFastPython", "url": "https://superfastpython.com/asyncio-task-exceptions/", "source": "duckduckgo_html", "grade": {"overall": 7.1, "relevance": 8.9, "depth": 6.8, "authority": 5.0, "freshness": 5.0, "word_count": 1360, "intent_hits": 8}, "query_origin": "python asyncio best practices for error handling"}], "timestamp": "2026-07-10T02:01:27.474035Z", "success": true, "error": null, "deep": {"query": "python asyncio best practices", "markdown": "Python's `asyncio` library provides a powerful framework for asynchronous I/O, enabling concurrent execution of tasks. A key aspect of using `asyncio` effectively involves understanding coroutines, tasks, and the event loop, as well as handling potential exceptions. Always await tasks to ensure proper execution and exception propagation, and be mindful of blocking operations that can starve the event loop. Creating a task and not awaiting it can lead to silent failures, so always ensure tasks are awaited or managed within a TaskGroup.\n\n## Key findings:\n\n*   Coroutines are declared with `async/await` and need to be run by the event loop to execute [1, 2]. Simply calling a coroutine doesn't schedule it [2].\n*   `asyncio.create_task()` creates a task from a coroutine and schedules it for execution [2, 4]. Awaiting a task cedes control to the event loop [1].\n*   If a coroutine is called but not awaited or scheduled with `asyncio.create_task()`, a `RuntimeWarning` will be emitted [3].\n*   Blocking I/O operations (like `time.sleep()`) can starve the event loop and prevent other tasks from running [5]. Use `await asyncio.sleep()` instead [5].\n*   Always await tasks to catch exceptions; otherwise, they may be silently ignored [7, 8]. Use TaskGroups to manage and handle exceptions from multiple tasks [7].\n*   Close asynchronous generators explicitly to prevent unexpected behavior during event loop shutdown [3].\n*   When handling exceptions in async code, use `try/except` statements to catch exceptions raised by awaited coroutines [6].\n*   Circuit breakers can prevent wasting time on failing services and allow graceful degradation [7].\n*   Fanout-fanin is a pattern for parallel work coordination, where work is scattered to multiple tasks and results are gathered [7].\n\n## Details:\n\nThe `asyncio` event loop is responsible for managing the execution of coroutines and tasks. It handles I/O operations and switches between coroutines when an `await` statement is encountered. When a task finishes, it adds callbacks to the event loop, which can resume other tasks [1].  Awaiting a task re-raises any exceptions it encountered, allowing for error handling [6, 8]. If a task raises an exception and isn't awaited, the exception is stored in the task object but not propagated immediately [6].  To retrieve an exception from a task, you can call `task.result()` after the task has completed [8].\n\n## Sources:\n\n1.  [1] A Conceptual Overview of asyncio \u2014 Python 3.14.6 documentation\n2.  [2] Coroutines and tasks \u2014 Python 3.14.6 documentation\n3.  [3] Developing with asyncio \u2014 Python 3.15.0b1 documentation\n4.  [4] asyncio \u2014 asynchronous I/O scheduler \u2014 MicroPython latest documentation\n5.  [5] Fixing asyncio concurrency with blocking I/O [Solved]\n6.  [6] Asynchronous Exception Handling in Python: A Practical Guide with ...\n7.  [7] Advanced Asyncio Python: Real-World Patterns and Anti-Patterns\n8.  [8] How to Handle Asyncio Task Exceptions - SuperFastPython", "sources": [{"index": 1, "title": "A Conceptual Overview of asyncio \u2014 Python 3.14.6 documentation", "url": "https://docs.python.org/3/howto/a-conceptual-overview-of-asyncio.html", "source": "brave", "grade": {"overall": 8.0, "relevance": 10, "depth": 6.7, "authority": 7.0, "freshness": 5.0, "word_count": 1331, "intent_hits": 8}, "query_origin": "asyncio<pad>"}, {"index": 2, "title": "Coroutines and tasks \u2014 Python 3.14.6 documentation", "url": "https://docs.python.org/3/library/asyncio-task.html", "source": "brave", "grade": {"overall": 7.9, "relevance": 10, "depth": 6.0, "authority": 7.0, "freshness": 5.0, "word_count": 1204, "intent_hits": 8}, "query_origin": "asyncio<pad>"}, {"index": 3, "title": "Developing with asyncio \u2014 Python 3.15.0b1 documentation", "url": "https://docs.python.org/3.15/library/asyncio-dev.html", "source": "duckduckgo_html", "grade": {"overall": 7.7, "relevance": 10, "depth": 5.0, "authority": 7.0, "freshness": 5.0, "word_count": 1010, "intent_hits": 8}, "query_origin": "python asyncio common mistakes and anti-patterns"}, {"index": 4, "title": "asyncio \u2014 asynchronous I/O scheduler \u2014 MicroPython latest documentation", "url": "https://docs.micropython.org/en/latest/library/asyncio.html", "source": "brave", "grade": {"overall": 7.6, "relevance": 10, "depth": 4.6, "authority": 7.0, "freshness": 5.0, "word_count": 925, "intent_hits": 8}, "query_origin": "asyncio<pad>"}, {"index": 5, "title": "Fixing asyncio concurrency with blocking I/O [Solved]", "url": "https://www.technetexperts.com/asyncio-blocking-call-concurrency-fix/", "source": "duckduckgo_html", "grade": {"overall": 7.6, "relevance": 10, "depth": 4.4, "authority": 5.0, "freshness": 8.0, "word_count": 880, "intent_hits": 8}, "query_origin": "how to prevent blocking the asyncio event loop"}, {"index": 6, "title": "Asynchronous Exception Handling in Python: A Practical Guide with ...", "url": "https://www.pythontutorials.net/blog/asynchronous-exception-handling-in-python/", "source": "duckduckgo_html", "grade": {"overall": 7.2, "relevance": 10, "depth": 4.7, "authority": 5.0, "freshness": 5.0, "word_count": 939, "intent_hits": 8}, "query_origin": "python asyncio best practices for error handling"}, {"index": 7, "title": "Advanced Asyncio Python: Real-World Patterns and Anti-Patterns", "url": "https://pythonz2h.com/chapter_09_concurrency_and_parallelism/series_03_advanced_asyncio_patterns/patterns_antipatterns", "source": "duckduckgo_html", "grade": {"overall": 7.1, "relevance": 10, "depth": 4.3, "authority": 5.0, "freshness": 5.0, "word_count": 861, "intent_hits": 8}, "query_origin": "python asyncio common mistakes and anti-patterns"}, {"index": 8, "title": "How to Handle Asyncio Task Exceptions - SuperFastPython", "url": "https://superfastpython.com/asyncio-task-exceptions/", "source": "duckduckgo_html", "grade": {"overall": 7.1, "relevance": 8.9, "depth": 6.8, "authority": 5.0, "freshness": 5.0, "word_count": 1360, "intent_hits": 8}, "query_origin": "python asyncio best practices for error handling"}], "graded_count": 21, "total_count": 51, "model": "google/gemma-3-12b-it", "elapsed": 207.95, "cache_hit": true, "rounds": 2, "queries_tried": ["python asyncio best practices", "how to use asyncio correctly python", "asyncio<pad>", "python asyncio guide", "python asyncio common mistakes and anti-patterns", "python asyncio best practices for error handling", "how to prevent blocking the asyncio event loop", "site:stackoverflow.com python asyncio best practices<pad>"], "error": null}}