Unit of Work for Python — composable units, transactional work managers, and a domain model toolkit.
📖 Read the docs · Quickstart · PyPI
What is PyUoW?
PyUoW is a Python implementation of the Unit of Work behavioural pattern. It gives you small, typed building blocks for business logic that compose into a flow and run inside a Work Manager that handles transactions, batching, and domain events.
The result: business logic that reads top-to-bottom, separates orchestration from execution, and stays testable as it grows.
Highlights
- Composable units — write each step as a
ConditionalUnit/RunUnit/FinalUnit, chain them with>>, validate the chain at build time. - Transactional out of the box — a SQLAlchemy adapter ships in
pyuow.contrib.sqlalchemy(sync + async), with nested-transaction support. - Domain-first —
Entity,AuditedEntity,SoftDeletableEntity,VersionedEntity, and an event-emittingModelbase, all immutable dataclasses. - Sync and async parity — every primitive has an
aio/twin; pick one per flow. - Strict types — passes
mypy --strict; runs on Python 3.10 through 3.14.
Install
pip install pyuow # core
pip install "pyuow[sqlalchemy]" # with SQLAlchemy integration
Python ≥ 3.10.
AI-agent skill
After installing, run pyuow install-skill to drop an AI-agent skill file into your project so Claude Code / OpenCode learn PyUoW's idioms. Add --global to install for your user account, or --check to dry-run.
See the step-by-step guide (or docs/install-skill.md).
At a glance
from dataclasses import dataclass
from pyuow import (
BaseContext, BaseParams, ConditionalUnit, ErrorUnit,
FinalUnit, Result, RunUnit,
)
from pyuow.work.noop import NoOpWorkManager
@dataclass(frozen=True)
class Greeting(BaseParams):
name: str
@dataclass
class Ctx(BaseContext[Greeting]):
params: Greeting
class IsNamePresent(ConditionalUnit[Ctx, str]):
def condition(self, ctx: Ctx) -> bool:
return bool(ctx.params.name)
class Greet(RunUnit[Ctx, str]):
def run(self, ctx: Ctx) -> None:
print(f"Hello, {ctx.params.name}!")
class Done(FinalUnit[Ctx, str]):
def finish(self, ctx: Ctx) -> Result[str]:
return Result.ok("greeted")
flow = (
IsNamePresent(on_failure=ErrorUnit(exc=ValueError("name required")))
>> Greet()
>> Done()
).build()
result = NoOpWorkManager().by(flow).do_with(Ctx(params=Greeting(name="Alice")))
assert result.get() == "greeted"
What's in the box
| Concept | What it gives you |
|---|---|
| Units & Flow | ConditionalUnit / RunUnit / FinalUnit / ErrorUnit, chained with >> |
| Result | ok / error / empty plus .map, .and_then, .unwrap_or |
| Context | Mutable, immutable, and domain-aware context bases |
| Work Manager | NoOp, transactional, and domain-transactional managers |
| Domain Model | Entity, AuditedEntity, Model, Batch, events, typed exceptions |
| DataPoints | Typed producer / consumer contracts between units |
| SQLAlchemy | Ready-made repositories, table mixins, and transaction manager |
| Async | A sync and an aio/ twin for every primitive |
Contributing
PRs welcome — see CONTRIBUTING.md for the dev setup, or run:
poetry install --with docs
make tests # pytest + coverage
make fmt # ruff + mypy
make docs-serve # live preview at http://127.0.0.1:8000
2 maintainers
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