Build Status Code Coverage Documentation Gitter chat Tidelift

AnyIO is an asynchronous networking and concurrency library that works on top of either asyncio or Trio. It implements Trio-like structured concurrency (SC) on top of asyncio and works in harmony with the native SC of Trio itself.

Applications and libraries written against AnyIO’s API will run unmodified on either asyncio or Trio. AnyIO can also be adopted into a library or application incrementally – bit by bit, no full refactoring necessary. It will blend in with the native libraries of your chosen backend.

To find out why you might want to use AnyIO’s APIs instead of asyncio’s, you can read about it here.

Documentation

View full documentation at: https://anyio.readthedocs.io/

Features

AnyIO offers the following functionality:

  • Task groups (nurseries in trio terminology)

  • High-level networking (TCP, UDP and UNIX sockets)

    • Happy eyeballs algorithm for TCP connections (more robust than that of asyncio on Python 3.8)

    • async/await style UDP sockets (unlike asyncio where you still have to use Transports and Protocols)

  • A versatile API for byte streams and object streams

  • Inter-task synchronization and communication (locks, conditions, events, semaphores, object streams and futures)

  • Worker threads

  • Subprocesses

  • Subinterpreter support for code parallelization (on Python 3.13 and later)

  • Asynchronous file I/O (using worker threads)

  • Signal handling

  • Asynchronous versions of the functools and itertools modules

AnyIO also comes with its own pytest plugin which also supports asynchronous fixtures. It even works with the popular Hypothesis library.

Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

Project links

Data verified by PyPI on Sep 5, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Latest release

5 maintainers

PyPI data
Data sourced directly from PyPI's database.
Avatar for agronholm from gravatar.com agronholm Avatar for njs from gravatar.com njs Avatar for smurfix from gravatar.com smurfix
+2 more Avatar for Thomas.Grainger from gravatar.com Thomas.Grainger Avatar for Zac-HD from gravatar.com Zac-HD

Credits

Author: Alex Grönholm

GitHub Statistics

Data verified by PyPI on Sep 5, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.10

Provides Extra

trio

Classifiers

Report project as malware

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

anyio-4.15.1.tar.gz (277.0 kB view details)

Uploaded Source

Built Distribution

If you're not sure about the file name format, learn more about wheel file names.

anyio-4.15.1-py3-none-any.whl (132.1 kB view details)

Uploaded Python 3

File details

Details for the file anyio-4.15.1.tar.gz.

File metadata

  • Download URL: anyio-4.15.1.tar.gz
  • Upload date:
  • Size: 277.0 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for anyio-4.15.1.tar.gz
Algorithm Hash digest
SHA256 9f28306018cbd6d329e64a36d58256edff76dd996fe423bc957326e578b82a94
MD5 81aa5fa618b7f6db96d719b81a1a67f7
BLAKE2b-256 a9d2f4d173e22df740bc37b1db102b386ba719b66e95b0f0d751f556b387e6d2

See more details on using hashes here.

Provenance

The following attestation bundles were made for anyio-4.15.1.tar.gz:

Publisher: publish.yml on agronholm/anyio

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file anyio-4.15.1-py3-none-any.whl.

File metadata

  • Download URL: anyio-4.15.1-py3-none-any.whl
  • Upload date:
  • Size: 132.1 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for anyio-4.15.1-py3-none-any.whl
Algorithm Hash digest
SHA256 6152fdbbf9a77fdec97731721bebf7c4c44f7c29b424b0065826173efc7ed101
MD5 c2ab8e46292b23c5d22e66732582dee2
BLAKE2b-256 12b84bd346e22b28902df4d651910f5242c28d84e4a5c2435ca5c3f797ed7e2e

See more details on using hashes here.

Provenance

The following attestation bundles were made for anyio-4.15.1-py3-none-any.whl:

Publisher: publish.yml on agronholm/anyio

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

This release

4.15.1 This release

2 files

4.15.0

2 files

4.14.2

2 files

4.14.1

2 files

4.14.0

2 files

4.13.0

2 files

4.12.1

2 files

4.12.0

2 files

4.11.0

2 files

4.10.0

2 files

4.9.0

2 files

4.8.0

2 files

4.7.0

2 files

4.6.2.post1

2 files

Yanked

4.6.2

2 files

Yanked reason: This was 4.5.2 code, mistagged

4.6.1

2 files

4.6.0

2 files

4.5.2

2 files

4.5.1

2 files

4.5.0

2 files

4.4.0

2 files

4.3.0

2 files

4.2.0

2 files

4.1.0

2 files

4.0.0

2 files

Pre-release

4.0.0rc1

2 files

3.7.1

2 files

3.7.0

2 files

Pre-release

3.7.0rc1

2 files

3.6.2

2 files

3.6.1

2 files

3.6.0

2 files

3.5.0

2 files

3.4.0

2 files

3.3.4

2 files

3.3.3

2 files

3.3.2

2 files

3.3.1

2 files

3.3.0

2 files

3.2.1

2 files

3.2.0

2 files

3.1.0

2 files

3.0.1

2 files

3.0.0

2 files

Pre-release

3.0.0rc4

2 files

Pre-release

3.0.0rc3

2 files

Pre-release

3.0.0rc2

2 files

Pre-release

3.0.0rc1

2 files

2.2.0

2 files

2.1.0

2 files

2.0.2

2 files

2.0.1

2 files

2.0.0

2 files

Pre-release

2.0.0rc2

2 files

Pre-release

2.0.0rc1

2 files

Pre-release

2.0.0b2

2 files

Pre-release

2.0.0b1

2 files

1.4.0

2 files

1.3.1

2 files

1.3.0

2 files

1.2.3

2 files

1.2.2

2 files

1.2.1

2 files

1.2.0

2 files

1.1.0

2 files

1.0.0

2 files

Pre-release

1.0.0rc2

2 files

Pre-release

1.0.0rc1

2 files

Pre-release

1.0.0b2

2 files

Pre-release

1.0.0b1

2 files

Pre-release

1.0.0a2

2 files

Pre-release

1.0.0a1

2 files

Anthropic, PBC Visionary sponsor Bloomberg Visionary sponsor Hudson River Trading Visionary sponsor Meta Visionary sponsor NVIDIA Visionary sponsor Microsoft Sustainability sponsor Depot Continuous Integration AWS Cloud computing and Security Sponsor Datadog Monitoring Fastly CDN Google Download Analytics Sentry Error logging StatusPage Status page