What if your database worked more like Git? Every change captured as an immutable event you can replay, instead of a single mutating row that quietly forgets its own history. That's event sourcing, and Chris May is back on Talk Python, fresh off our Datastar panel, to walk us through what it actually looks like in Python. We'll cover the core patterns, the libraries to reach for, when not to use it, and why event sourcing turns out to be a surprisingly good fit for AI-assisted coding. 
 
Episode sponsors 
 
<a href='https://talkpython.fm/sentry'>Sentry Error Monitoring, Code talkpython26</a>
<a href='https://talkpython.fm/temporal'>Temporal</a>
<a href='https://talkpython.fm/training'>Talk Python Courses</a> 
 
<h2 class="links-heading mb-4">Links from the show</h2>
<div>Guest 
Chris May: <a href="https://everydaysuperpowers.dev?featured_on=talkpython" target="_blank" >everydaysuperpowers.dev</a> 
 
Intro to event sourcing e-book: <a href="https://everydaysuperpowers.gumroad.com/l/es_intro?featured_on=talkpython" target="_blank" >everydaysuperpowers.gumroad.com</a> 
 
Domain-Driven Design: The Power of CQRS and Event Sourcing: How CQRS/ES Redefine Building Scalable System: <a href="https://ricofritzsche.me/cqrs-event-sourcing-projections/?featured_on=talkpython" target="_blank" >ricofritzsche.me</a> 
DDD: <a href="https://www.amazon.com/Domain-Driven-Design-Tackling-Complexity-Software/dp/0321125215?featured_on=talkpython" target="_blank" >www.amazon.com</a> 
Understanding Eventsourcing (Martin Dilger): <a href="https://www.amazon.com/Understanding-Eventsourcing-Planning-Implementing-Eventmodeling/dp/B0DNXQJM9Z/ref=sr_1_1?dib=eyJ2IjoiMSJ9.LqdaOIXJSPbgGuz_Akil-snFyMZVys1Y2IhnqvPv_CGK3R6Vwvu6AN1PHBi6twz-c3bPG5mdbhLJQyYs30LXh2pT6wiqXPrz0RKmfeYzq_sT18tc2UAWVG8rFBN1C-H46AHiiDqusp6SyDm2W15n4ZBKn11xW4yNvazjq3pg369c53KDFONnWqe9AB4xzAF2VeQ4n64hOk30-GmG_1K6_zIPBw4PXkVX9UDYq0QDIAQ.0Kvsl2V8aqDO4Av47g881GGoRPCpF0gCrbF6GJZbjRE&dib_tag=se&keywords=understanding+event+sourcing&qid=1777078561&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=8-1&featured_on=talkpython" target="_blank" >www.amazon.com</a> 
Event Sourcing Explained using Football Video: <a href="https://www.youtube.com/watch?v=xPmQxYIi5fA" target="_blank" >www.youtube.com</a> 
Why I finally embraced event sourcing and why you should too article: <a href="https://everydaysuperpowers.dev/articles/why-i-finally-embraced-event-sourcingand-why-you-should-too/?featured_on=talkpython" target="_blank" >everydaysuperpowers.dev</a> 
valkey: <a href="https://valkey.io/?featured_on=talkpython" target="_blank" >valkey.io</a> 
diskcache: <a href="https://talkpython.fm/episodes/show/534/diskcache-your-secret-python-perf-weapon" target="_blank" >talkpython.fm</a> 
eventsourcing package: <a href="https://github.com/pyeventsourcing/eventsourcing?featured_on=talkpython" target="_blank" >github.com</a> 
eventsourcing docs: <a href="https://eventsourcing.readthedocs.io/en/stable/topics/tutorial/part1.html?featured_on=talkpython" target="_blank" >eventsourcing.readthedocs.io</a> 
John Bywater: <a href="https://github.com/johnbywater?featured_on=talkpython" target="_blank" >github.com</a> 
Datastar: <a href="https://data-star.dev/?featured_on=talkpython" target="_blank" >data-star.dev</a> 
Microconf: <a href="https://microconf.com/?featured_on=talkpython" target="_blank" >microconf.com</a> 
Event Modeling & Event Sourcing Podcast: <a href="https://podcast.eventmodeling.org?featured_on=talkpython" target="_blank" >podcast.eventmodeling.org</a> 
Python Package Guides for AI Agents: <a href="https://github.com/mikeckennedy/python-package-guides-for-agents?featured_on=talkpython" target="_blank" >github.com</a> 
Iodine tablets AI joke: <a href="https://x.com/pr0grammerhum0r/status/2046650199930458334?s=46&featured_on=pythonbytes" target="_blank" >x.com</a> 
KurrentDb: <a href="https://www.kurrent.io?featured_on=talkpython" target="_blank" >www.kurrent.io</a> 
 
Watch this episode on YouTube: <a href="https://www.youtube.com/watch?v=s37d6yN2P70" target="_blank" >youtube.com</a> 
Episode #548 deep-dive: <a href="https://talkpython.fm/episodes/show/548/event-sourcing-design-pattern#takeaways-anchor" target="_blank" >talkpython.fm/548</a> 
Episode transcripts: <a href="https://talkpython.fm/episodes/transcript/548/event-sourcing-design-pattern" target="_blank" >talkpython.fm</a> 
 
Theme Song: Developer Rap 
🥁 Served in a Flask 🎸: <a href="https://talkpython.fm/flasksong" target="_blank" >talkpython.fm/flasksong</a> 
 
---== Don't be a stranger ==--- 
YouTube: <a href="https://talkpython.fm/youtube" target="_blank" > youtube.com/@talkpython</a> 
 
Bluesky: <a href="https://bsky.app/profile/talkpython.fm" target="_blank" >@talkpython.fm</a> 
Mastodon: <a href="https://fosstodon.org/web/@talkpython" target="_blank" > @talkpython@fosstodon.org</a> 
X.com: <a href="https://x.com/talkpython" target="_blank" > @talkpython</a> 
 
Michael on Bluesky: <a href="https://bsky.app/profile/mkennedy.codes?featured_on=talkpython" target="_blank" >@mkennedy.codes</a> 
Michael on Mastodon: <a href="https://fosstodon.org/web/@mkennedy" target="_blank" > @mkennedy@fosstodon.org</a> 
Michael on X.com: <a href="https://x.com/mkennedy?featured_on=talkpython" target="_blank" > @mkennedy</a> </div>

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