I posted a lot about free threading in the past year:
Over all I had 3 issues with free-threading:
- Reference count contention hurts performance on even immutable objects.
- Often benign code abstractions can hurt multi-threading performance …
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Datetime Arithmetic in Python
Working with
datetimeis hard and error prone, but Python actually provides the right tools withtimedeltato work with them.It's a shame that most developers are not making the best use of it.
Basic Arithmetic
Let's first catch up what the basic operations are:
Advanced Arithmetic
Now, let's …
read moreCaching an Asyncio Function the Easy Way
If you've used asyncio for some time you've probably noticed a few things that work differently to the synchronous counter parts.
I recently had to add some caching to an asyncio function. Let's say something like:async def get_user(user_id: UUID) -> User: ...Of course naturally we want to use functools …
read moreCounting down Chinese New Year with Marimo
I've been on vacation in China leading up the lunar new year and I'd rather not spend all my time researching some heavy topic. However, I thought I might instead spend a few minutes combining my previous posts on marimo notebooks and the Lunar calendar.
read moreReplacing tox with UV
Recently I've been updating some of my libraries to Python 3.10+ after Python 3.9 has finally reached end of life.
The upgrade to Python 3.10 is a relatively simple one, but I thought it be a good idea to run tests on different versions of Python.
Existing …
read moreWebasgi - Run python web apps in a browser
Writing a SQS task framework from scratch
Recently I've been working on framework to run LLM tasks using AWS's excellent SQS. And I made the decision to write my own task framework/library as opposed to using a pre-exiting framework. I thought this would be a great opportunity to discuss the considerations and levels of abstractions involved …
read moreAsyncio is neither fast nor slow
Don't listen to random benchmarks..
I recently came across an article benchmarking Python performances in web frameworks, comparing asyncio and sync performance.
The author sets out to measure performance of FastAPI/Django web servers running with postgresql comparing async and non-async workloads. The methodology is pretty reasonable, the following is …
read moreI was wrong about Subinterpreters
... but that's actually a good thing
I've already written a ton about subinterpreters since a year ago:
- How good are sub-interpreters in Python now?
- Python 3.14: State of free threading
- Subinterpreters and Asyncio
Recently I had some time to dig a bit deeper into subinterpreters and check my understanding …
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