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Python: Bug: Please stop using deprecated/archived nest_asyncio package #13090
Description
Describe the bug
nest_asyncio has been archived by the owner for over a year now.
This has created problems with asyncio support in newer versions of Python and other packages which depend on these newer features. Specifically Python 3.12+ added an optional loop_factory parameter, however the patched version of asyncio.run from nest_asyncio's patched run method doesn't pass-through this keyword argument resulting in errors like:
> asyncio_run(amain(), loop_factory=get_loop_factory())
E TypeError: _patch_asyncio.<locals>.run() got an unexpected keyword argument 'loop_factory'
To Reproduce
Attempt to use newer asyncio features
Expected behavior
Don't patch the stdlib
Screenshots
N/A
Platform
- Language: Python
- Source: pypi v1.24.1, however the dependency still exists in the main branch https://github.com/microsoft/semantic-kernel/blob/main/python/pyproject.toml#L52
- AI model: N/A
- IDE: N/A
- OS: Linux
Additional context
N/A
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[-]Bug: Please stop using deprecated/archived `nest_asyncio` package[/-][+]Python: Bug: Please stop using deprecated/archived `nest_asyncio` package[/+]eavanvalkenburg commentedon Sep 10, 2025
Unfortunately we currently can't do without it for the Handlebars templates, so we either remove those, or we would need a new handlebars package that can call async functions.
Chaoses-Ib commentedon Nov 20, 2025
I've made a fork of
nest-asyncioto fix support for Python 3.12 and 3.14: nest-asyncio2. Since it's also used in my own project, I'm going to maintain it for a long time. There is no behavior change on Python < 3.12, and it's already tested with ipykernel, https://github.com/NVIDIA/NeMo-Agent-Toolkit, https://github.com/pyvista/pyvista, https://github.com/Chaoses-Ib/ComfyScript, so it should be a safe replacement.github-actions commentedon Feb 27, 2026
This issue is stale because it has been open for 90 days with no activity.
github-actions commentedon Mar 13, 2026
This issue was closed because it has been inactive for 14 days since being marked as stale.