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Why Python Is Slow: Talking about SPy on the Behind the Commit Podcast During EuroPython 2025 I had the pleasure to talk to Mia Bajić for her podcast Behind The Commit . In the chat we mainly talk about Python performance and how SPy tries to improve them

Inside SPy , part 2: Language semantics This is the second post of the Inside SPy series. The firstpost was mostly about motivations andgoals of SPy . This post will cover in more detail thesemantics of SPy, including the parts which make it different fro

My first OSS commit turns 20 today Some time ago I realized that it was 20 years since I started to contribute toOpen Source. It's easy to remember, because I started to work on PyPy as part of mymaster's thesis and I graduated in 2006. So, I did a bit of

Inside SPy , part 1: Motivations and Goals This is the first of a series of posts in which I will try to give a deep explanation of SPy , including motivations, goals, rules of thelanguage, differences with Python and implementation details. This post foc

Tracing JITs in the real world @ CPython Core Dev Sprint .slide { border: 2px solid #ddd; border-radius: 8px; margin: 2...

Inside CPython's attribute lookup Python's attribute lookup logic seems pretty simple at a first glance: "firstlook in the instance __dict__ , then look in its type". However, the actual logic is much more complex because it needs to take intoaccount the

EuroPython 2025 slides Here are the slides for the three speeches which I gave at EuroPython 2025 :

Claude code modified my .bashrc without asking? !!! note "Note" This is not the classical post about running claude in YOLO mode and then complaining that it damaged the system. I have reasons to think that claude automatically modified my .bashrc to remo

SPy @ PyCon IT 2025 Yesterday I talked about SPy at PyCon Italy . Thanks to a hre...

Tales with claude code: how to make it behave? In the past weeks, I have been experimenting with using claude code to speedup development, in particular of SPy . My experience so far reveals a clear pattern: claude excels at simple,one-shot tasks that fol