---
id: nest-asyncio2
version: "1.7.2"
license: BSD
license_treatment: permissive
maintenance: aging
---

# nest-asyncio2 — Patch asyncio to allow nested event loops

License: permissive · Maintenance: aging · Popularity: top 1,000 on PyPI

## Install

pip install nest-asyncio2
uv add nest-asyncio2
poetry add nest-asyncio2

## Description

# nest-asyncio2
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## Introduction

By design asyncio [does not allow](https://github.com/python/cpython/issues/66435)
its event loop to be nested. This presents a practical problem:
When in an environment where the event loop is
already running it's impossible to run tasks and wait
for the result. Trying to do so will give the error
"`RuntimeError: This event loop is already running`".

The issue pops up in various environments, such as web servers,
GUI applications and in Jupyter notebooks.

This module patches asyncio to allow nested use of `asyncio.run` and
`loop.run_until_complete`.

## Installation

```sh
pip3 install nest-asyncio2
```

Python...

## AI interpretation — verify before relying

Patches asyncio to allow nested event loops, enabling asyncio.run() and loop.run_until_complete() to work within already-running event loops—solving the "event loop is already running" error in Jupyter, web servers, and GUI applications.

Verdict: Stable, low-friction solution to a real asyncio limitation with broad Python version support and no external dependencies. Maintenance is aging but the package is actively maintained and addresses known issues in newer Python versions. Safe for production use in environments where nested event loops are necessary.

[View on SkillFed](https://skillfed.io/packages/nest-asyncio2) · [View on PyPI](https://pypi.org/project/nest-asyncio2/)