txaio
txaio is a helper library for writing code that runs unmodified on both Twisted and asyncio / Trollius.
This is like six, but for wrapping over differences between Twisted and asyncio so one can write code that runs unmodified on both (aka source code compatibility). In other words: your users can choose if they want asyncio or Twisted as a dependency.
Note that, with this approach, user code runs under the native event loop of either Twisted or asyncio. This is different from attaching either one's event loop to the other using some event loop adapter.
Platform support
txaio runs on CPython 3.6+ and PyPy 3, on top of Twisted or asyncio. Specifically, txaio is tested on the following platforms:
- CPython 3.6 and 3.9 on Twisted 18.7, 19.10, trunk and on asyncio (stdlib)
- PyPy 3.6 an 3.7 on Twisted 18.7, 19.10, trunk and on asyncio (stdlib)
> Note: txaio up to version 18.8.1 also supported Python 2.7 and Python 3.4. Beginning with release v20.1.1, txaio only supports Python 3.5+. Beginning with release v20.12.1, txaio only supports Python 3.6+.
How it works
Instead of directly importing, instantiating and using Deferred (for
Twisted) or Future (for asyncio) objects, txaio provides
helper-functions to do that for you, as well as associated things like
adding callbacks or errbacks.
This obviously changes the style of your code, but then you can choose at runtime (or import time) which underlying event-loop to use. This means you can write one code-base that can run on Twisted or asyncio (without a Twisted dependency) as you or your users see fit.
Code like the following can then run on either system:
import txaio
txaio.use_twisted() # or .use_asyncio()
f0 = txaio.create_future()
f1 = txaio.as_future(some_func, 1, 2, key='word')
txaio.add_callbacks(f0, callback, errback)
txaio.add_callbacks(f1, callback, errback)
# ...
txaio.resolve(f0, "value")
txaio.reject(f1, RuntimeError("it failed"))
Please refer to the documentation for description and usage of the library features.
AI Policy
IMPORTANT: A Note on Upcoming Policy Changes Regarding AI-Assisted Content
Up to and including release v25.6.1, this project contains no code or documentation generated with the assistance of AI tools. This version represents the final release under our historical contribution policy. Starting with future versions (after release v25.6.1), our contribution policy will change. Subsequent releases MAY contain code or documentation created with AI assistance.
We urge all users and contributors to review our AI Policy. This document details:
- The rules and warranties required for all future contributions.
- The potential intellectual property implications for the project and its users.
This policy was established following an open community discussion, which you can review on GitHub issue #1663.
We are providing this transparent notice to enable you to make an informed decision. If our new AI policy is incompatible with your own (or your organization's) development practices or risk tolerance, please take this into consideration when deciding whether to upgrade beyond version v25.6.1.
Release files for txaio 25.9.2
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| txaio-25.9.2.tar.gz | 50.0 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| txaio-25.9.2-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 81.3 kB
Release files / txaio-25.9.2.tar.gz
| Download URL | txaio-25.9.2.tar.gz |
|---|---|
| Size | 50.0 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
e42004a077c02eb5819ff004a4989e49db113836708430d59cb13d31bd309099
|
|
BLAKE2b-256 checksum How to use checksums |
2b202e7ccea9ab2dd824d0bd421d9364424afde3bb33863afb80cd9180335019
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 25, 2025.
Transparency logRelease files / txaio-25.9.2-py3-none-any.whl
| Download URL | txaio-25.9.2-py3-none-any.whl |
|---|---|
| Size | 31.3 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
a23ce6e627d130e9b795cbdd46c9eaf8abd35e42d2401bb3fea63d38beda0991
|
|
BLAKE2b-256 checksum How to use checksums |
7e2ce276b80f73fc0411cefa1c1eeae6bc17955197a9c3e2b41b41f957322549
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 25, 2025.
Transparency log
