Reference library

Streaming & messaging

Kafka-style pub/sub, event consumers, async pipelines, and message-driven workflows.

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Streaming & messaging easy

Event sourcing append store replay in Python

A simple in-memory event store that appends events per aggregate and replays them on demand.

event-sourcing append-only replay
Python 
import json
from collections import defaultdict


class EventStore:
    def __init__(self):
        self._events = defaultdict(list)

    def append(self, aggregate_id, event_type, data):
        event = {"type": event_type, "data": data}
        self._events[aggregate_id].append(event)

    def replay(self, aggregate…
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