How to Install `async-timeout` in Python

v5.0.1 Async & Networking Python >=3.8 Apache 2

Timeout context manager for asyncio programs

Install pip install async-timeout

What is async-timeout?

Timeout context manager for asyncio programs

asyncio-compatible timeout context manager.

This library has effectively been upstreamed into Python 3.11+.

Therefore this library is considered deprecated and no longer actively supported.

Documentation → PyPI page → Author: Andrew Svetlov <[email protected]>

Quick Start

Minimal example to get started with async-timeout:

import async_timeout

print(async_timeout.__version__)

Installation

pip (standard)

pip install async-timeout

Virtual environment (recommended)

python -m venv venv
source venv/bin/activate   # Windows: venv\Scripts\activate
pip install async-timeout

pip3

pip3 install async-timeout

conda

conda install -c conda-forge async-timeout

Poetry

poetry add async-timeout

Verify the Installation

After installing, confirm the package is available:

python -c "import async_timeout; print(async_timeout.__version__)"

If this prints a version number, installation succeeded. If you see a ModuleNotFoundError, see the errors section below.

Installation Errors

Common errors when installing async-timeout with pip.

ModuleNotFoundError: No module named 'async_timeout'

Cause: The package is not installed in the current Python environment.

Fix: Run pip install async-timeout. If using a virtual environment, ensure it is activated first.

ModuleNotFoundError: No module named 'async_timeout' (installed but still failing)

Cause: pip installed the package into a different Python than the one running your script.

Fix: Use python -m pip install async-timeout to install into the interpreter you are running.

ImportError: cannot import name 'X' from 'async_timeout'

Cause: The function or class does not exist in the installed version.

Fix: Check the version with pip show async-timeout and upgrade with pip install --upgrade async-timeout.

pip: command not found

Cause: pip is not in PATH or Python was not added to PATH during installation.

Fix: Try python -m pip install async-timeout. On macOS/Linux try pip3.

PermissionError: [Errno 13] Permission denied

Cause: No write access to the system Python package directory.

Fix: Use a virtual environment, or add --user: pip install --user async-timeout

SSL: CERTIFICATE_VERIFY_FAILED

Cause: pip cannot verify PyPI's SSL certificate — common behind corporate proxies.

Fix: Try: pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org async-timeout

RuntimeError: This event loop is already running

Cause: Calling <code>asyncio.run()</code> inside Jupyter or another already-running event loop.

Fix: In Jupyter, use await directly. Or install nest_asyncio and call nest_asyncio.apply().

Recent Releases

Version	Released
`5.0.1` latest	2024-11-06
`5.0.0`	2024-10-31
`4.0.3`	2023-08-10
`4.0.2`	2021-12-20
`4.0.1`	2021-11-10

Full release history on PyPI →

Manage async-timeout

Upgrade to latest version

pip install --upgrade async-timeout

Install a specific version

pip install async-timeout==5.0.1

Uninstall

pip uninstall async-timeout

Check what is installed

pip show async-timeout

Last updated: 2026-04-11 • Data from PyPI

How to Install async-timeout in Python