Installation

Python 3.10+ is required.

pip install python-cqrs

Extras (5.0+)

Extra	Provides
pydantic	PydanticRequest, PydanticResponse, Pydantic*Event
sqlalchemy	SQLAlchemy outbox + saga storage
sqlmodel	SQLModel outbox + saga storage (same behavior as SQLAlchemy; 5.1+)
kafka	Kafka broker (aiokafka)
rabbit	AMQP broker
protobuf	Protobuf serializers
aiobreaker	Circuit breaker helpers
examples	FastAPI / FastStream sample stack

pip install "python-cqrs[pydantic,sqlalchemy]"
pip install "python-cqrs[sqlmodel]"
pip install "python-cqrs[kafka]"

Dataclass-based Request / Response / Event types are the defaults. See Migration 4→5 for the full breaking-change list. Outbox and saga storage with SQLAlchemy or SQLModel is described in ORM.