asyncer
Asyncer, async and await, focused on developer experience.
Decision gist · record as of 2026-08-14
Yes, if you regularly mix async and sync code and want better type safety and editor support. The low install friction, active maintenance, MIT license, and zero known vulnerabilities make it a safe choice. Pin the exact version as recommended in the documentation, and ensure you have tests. Not necessary if your project is purely async or purely sync.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low friction install with only three runtime dependencies (anyio, sniffio, typing_extensions).
- Actively maintained with a recent release; however, the package is explicitly marked as small and potentially subject to change, so pinning the exact version is recommended.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions; suitable for most projects without licensing concerns.
last release 2026-06-25 (50 days) · last repo commit 2026-08-12 · 2,482 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 8,262,619 downloads/mo, #1,640 on PyPI
Alternatives
Verify before relying
pip install asyncer
import time
import anyio
from asyncer import asyncify
def do_sync_work(name: str):
time.sleep(1)
return f"Hello, {name}"
async def main():
message = await asyncify(do_sync_work)(name="World")
print(message)
anyio.run(main)- Whether the library's 4 functions remain stable across versions or if breaking changes are expected.
- Performance characteristics when using asyncify() with long-running blocking operations.
What it is and what it does
Asyncer is a lightweight utility library that sits on top of AnyIO to make async/await code more convenient and type-safe. It provides a small set of functions—the package explicitly states there are just 4—designed to improve developer experience through better editor autocompletion, inline type checking, and mypy support. The main use case is calling synchronous blocking code from within async contexts without blocking the event loop; asyncify() wraps a sync function and runs it in a worker thread via AnyIO.
The library is intentionally minimal and opinionated, reflecting the author's subjective view on ergonomic async patterns. Because it is small and still in Beta status, the authors recommend pinning the exact version and having tests in place before upgrading. The package is actively maintained and has no known vulnerabilities.
Use it for
- Call blocking I/O or CPU-bound sync functions from async code without freezing the event loop.
- Improve type hints and editor autocompletion when working with async/await patterns.
- Verify async code correctness using mypy and other static type checkers.
- Simplify mixing of synchronous and asynchronous code in the same project.
- Reduce boilerplate when adapting legacy sync libraries for use in async applications.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you regularly mix async and sync code and want better type safety and editor support.
The low install friction, active maintenance, MIT license, and zero known vulnerabilities make it a safe choice. Pin the exact version as recommended in the documentation, and ensure you have tests. Not necessary if your project is purely async or purely sync.
Install
asyncer on PyPI
Before you install
Low friction install with only three runtime dependencies (anyio, sniffio, typing_extensions). Actively maintained with a recent release; however, the package is explicitly marked as small and potentially subject to change, so pinning the exact version is recommended.
Requires Python 3.10 or later.
License in practice
MIT license permits commercial and private use with minimal restrictions; suitable for most projects without licensing concerns.
Quickstart
pip install asyncer
import time
import anyio
from asyncer import asyncify
def do_sync_work(name: str):
time.sleep(1)
return f"Hello, {name}"
async def main():
message = await asyncify(do_sync_work)(name="World")
print(message)
anyio.run(main)Verify before relying
- Whether the library's 4 functions remain stable across versions or if breaking changes are expected.
- Performance characteristics when using asyncify() with long-running blocking operations.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packagesanyiosniffiotyping_extensions |
| Maintenance | Actively maintained 50 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 8,262,619 / month, #1,640 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaFramework :: AsyncIOFramework :: TrioIntended Audience :: DevelopersIntended Audience :: EducationIntended Audience :: Information TechnologyIntended Audience :: Science/ResearchIntended Audience :: System AdministratorsProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: InternetTyping :: Typed |
Evidence: asyncer-0.0.18-py3-none-any.whl
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