Nostr notes by Anže

I am the bottleneck 🫠 ...

2026-10-30T12:09:32Z

I am the bottleneck 🫠

Does anyone know the Checkov maintainers? I opened a PR that ...

2026-10-30T09:19:07Z

Does anyone know the Checkov maintainers?

I opened a PR that fixes a fork storm: Checkov’s object runners started a fresh pool of worker processes for every directory scanned (~56k forks for a scan of Checkov’s own repo). Loading the files in one batch gives:

• ~80% less total CPU on a full scan
• ~98% less kernel time
• 40x fewer processes
• identical results

A review would be much appreciated 🙏
https://github.com/bridgecrewio/checkov/pull/7756

#OpenSource #Python #DevSecOps

Hm... maybe, but I'm not sure about deployments. For a dev ...

2026-10-28T09:56:06Z

In reply to nevent1q…45jx
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Hm... maybe, but I'm not sure about deployments. For a dev tools like django-tui it's not a big deal if discovery gets the wrong virtualenv, but for production deployments we can't pick the wrong one so it has to be explicit imo.

django-tui 26.2 needs no setup 🎉 cd into any Django project ...

2026-10-27T19:14:24Z

django-tui 26.2 needs no setup 🎉

cd into any Django project and run:

uvx django-tui

No pip install, no INSTALLED_APPS. It finds your manage.py (even from a subdirectory), loads your .env files and uses the project’s own virtualenv, so your Django version and apps are the ones running.

Then browse and run your management commands, or query your models in the shell.

https://github.com/anze3db/django-tui

#Django #Python #uv

After this crazy week I’ve spent my Saturday away from ...

2026-10-24T18:47:10Z

After this crazy week I’ve spent my Saturday away from computers.

It felt great and I already feel recharged for whatever next week throws at us💪

potatoq has a dashboard now 🥔 The first question after launch ...

2026-10-22T23:31:58Z

potatoq has a dashboard now 🥔

The first question after launch was "where's the Flower equivalent?", so here it is:

• Live workers and the tasks they're running
• Queue sizes and periodic tasks
• Dead letters with the traceback, and a Retry button

It reads the broker directly: no events to turn on, nothing lost on restart. No extra dependencies either: `potatoq dashboard`, or mount it in Django, FastAPI or Flask.

https://anze3db.github.io/potatoq/guide/dashboard/

#Python #Django

yeah max risk, upgrade everything. 😞

2026-10-20T20:11:59Z

In reply to nevent1q…jc83
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yeah max risk, upgrade everything. 😞

yes, still waiting for patches for node, bun, debian, but that ...

2026-10-20T18:56:17Z

In reply to nevent1q…zu8z
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yes, still waiting for patches for node, bun, debian, but that shouldn't stop you upgrading what you can now!

Fun times indeed! 🫠

Some other things to upgrade: * Go: 1.27.3 or 1.26.10, then ...

2026-10-20T18:47:31Z

In reply to nevent1q…sk6k
_________________________

Some other things to upgrade:

* Go: 1.27.3 or 1.26.10, then rebuild your Go programs
* rustls-webpki: 0.103.16
* webpki-roots / webpki-root-certs: 1.0.10
* Electron: 44.9.1, 43.8.1 or 42.11.16
* NSS: 3.131.1
* Firefox: 158.0.1 (ESR: 153.5.1 or 115.43.1)
* Ubuntu ca-certificates: 20260816ubuntu0.<release>.1 (for 22.04, 24.04, 26.04 and 26.10)
* Homebrew ca-certificates: 2026-09-25_1
* Chrome, Apple, Windows: nothing to do, they’re blocked automatically

🚨Python friends, upgrade (or have your agent upgrade) every ...

2026-10-20T18:47:20Z

🚨Python friends, upgrade (or have your agent upgrade) every certifi package across all your projects and machines!

uv self update
uv lock --upgrade-package certifi

Private keys from 8 intermediate CA certs have been compromised!

https://x.com/astuyve/status/2112559796914167931

I’ve been frustrated with Celery, so I ran an experiment: could ...

2026-10-20T11:15:28Z

I’ve been frustrated with Celery, so I ran an experiment: could today’s LLMs build a better Python task queue?

My wish list:
• Defaults that don’t lose your jobs
• Free-threaded Python
• Django tasks
• Native broker features (SKIP LOCKED, quorum queues…)
• Celery-compatible

A couple of weeks later, it runs all my projects in production. 🎉

I called it potatoq 🥔 It’s still in alpha, but feedback welcome!

https://anze3db.github.io/potatoq/

#Python #Django

django-tui 26.1 is out, the first release in two years! 🎉 ...

2026-10-13T14:46:44Z

django-tui 26.1 is out, the first release in two years! 🎉

It's a complete redesign! You can now type a command like in your shell and the form fills in as you go.

pip install -U django-tui

What else is new: • Run multiple commands without restarting ...

2026-10-13T14:46:44Z

In reply to nevent1q…tw6q
_________________________

What else is new:
• Run multiple commands without restarting the tui
• A complete redesign
• Feels much snappier
• Slimmed down dependencies
• Python 3.11–3.15 and Django 5.2–6.1

On PyPI: https://pypi.org/project/django-tui/

Python 3.15 has been released 🎉 Grab it while it's fresh ...

2026-10-09T15:26:02Z

Python 3.15 has been released 🎉

Grab it while it's fresh 😉

https://www.python.org/downloads/release/python-3150/

RSVP on Meetup: ...

2026-09-30T10:18:14Z

In reply to nevent1q…nnxw
_________________________

RSVP on Meetup: https://www.meetup.com/python-lisbon-meetup/events/316776712/?slug=python-lisbon-meetup&eventId=316776712&isFirstPublish=true
Or RSVP on Luma: https://luma.com/c72p4hb0
Join us on Discord: https://discord.gg/ZQWZK6AXRk

🐍 Python Lisbon Meetup is tomorrow! 🎤 Talk by ...

2026-09-30T10:18:13Z

🐍 Python Lisbon Meetup is tomorrow!

🎤 Talk by Rodrigo 🐍🚀 (npub1c0x…ptl2)
⚡ Lightning talks
🍻 Socializing

📍 IST, Sala Multiusos, Torre Norte (new room, not the Pavilhão de Matemática!)
🕖 Thu, 1 Oct, 19:00

RSVP links below 👇

Fun fact, I gave a lightning talk about chess and then got caught ...

2026-09-23T05:26:22Z

In reply to nevent1q…3cu8
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Fun fact, I gave a lightning talk about chess and then got caught solving a chess puzzle during one the workshops 😅

PyCon Portugal continues to be my favorite PyCon. This year it ...

2026-09-23T05:26:19Z

PyCon Portugal continues to be my favorite PyCon. This year it was in Aveiro (a better Venice 😉) and we had a blast!

I enjoyed giving my talk on lazy imports, but the best part was meeting new people and catching up with friends.

Looking forward to it again next year!

We opened a support ticket, and the AI immediately identified the ...

2026-08-27T18:28:41Z

In reply to nevent1q…gjl0
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We opened a support ticket, and the AI immediately identified the issue as being on their end.

No answer to the ticket yet, but we no longer see the 30k charge in Cost Explorer 😮‍💨

If you are using Grok 4.6 through Bedrock Mantle, double-check how much you are spending!

I had a bit of a heart attack this morning when we noticed that ...

2026-08-27T18:28:39Z

I had a bit of a heart attack this morning when we noticed that my Grok 4.6 benchmark experiment using Amazon Bedrock would cost $28,044.59 instead of ~$28.00 that I was expecting 😱

Because I've written a similar snippet many times in the ...

2026-08-26T14:01:48Z

In reply to nevent1q…m9el
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Because I've written a similar snippet many times in the past, the first thing I did when I got home was write an open grep rule so our existing tools could catch it.

Blog post on why this can be very bad and how to protect yourself on my company blog:

https://www.fencer.dev/blog/python-class-pollution-opengrep-rule

One of the many things that I learned at DEF CON a few weeks ago ...

2026-08-26T14:01:48Z

One of the many things that I learned at DEF CON a few weeks ago is about Python Class Pollution and how a harmless snippet like the one below can cause a huge issue if an attacker controls it!

If you want to go straight to the source and see the original ...

2026-08-26T14:01:48Z

In reply to nevent1q…3d96
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If you want to go straight to the source and see the original research:

https://class-pollution.github.io/

https://jackfromeast.github.io/assets/Pyrl.pdf

My dog kept me in Zone 2 for 3kms. Then I had to drop him off and ...

2026-07-31T09:34:55Z

My dog kept me in Zone 2 for 3kms. Then I had to drop him off and immediately made bad decisions. 💛

We benchmarked 15 models for triaging vulnerabilities. * Kimi K3 ...

2026-07-31T09:04:46Z

We benchmarked 15 models for triaging vulnerabilities.

* Kimi K3 came out on top but marked a true positive as a false positive ☠️
* Opus 5 refused to give a verdict on 11 vulnerabilities
* Sonnet 5 and Luna outperformed Terra and Sol

Full post 👇
https://www.fencer.dev/blog/llm-triage-sast-false-positives

I committed all known licenses! Working on a license classifier ...

2026-07-27T16:45:21Z

In reply to nevent1q…udvc
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I committed all known licenses! Working on a license classifier PyPI package that I'm I'll hoping to publish later this week 🤞

Quite a way to start a Monday 😅 ...

2026-07-27T10:55:03Z

Quite a way to start a Monday 😅

I might have to try that but I don't think we'd be able ...

2026-07-21T12:20:30Z

In reply to nevent1q…86yy
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I might have to try that but I don't think we'd be able to remove the LLM voice, no matter how many times we ask the LLM to rewrite :(

I do think it nailed my voice though! ...

2026-07-21T11:24:54Z

In reply to nevent1q…hdp3
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I do think it nailed my voice though!

I asked Claude to come up with writing guidelines based on my ...

2026-07-21T11:13:55Z

I asked Claude to come up with writing guidelines based on my blog posts:

> A few things I deliberately did not encode as guidelines: the frequent typos (characteristic of your fast publishing cadence)

88 blog post in 14 years is not fast publishing cadence 😅

We hade a few team discussions on this and felt that mypy in ...

2026-07-06T12:42:07Z

In reply to nevent1q…vr04
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We hade a few team discussions on this and felt that mypy in tests could still be useful in certain cases. But now I found actual data showing that it's just false positives so we finally excluded all test files!

2. Turn on the DRF-type stubs we’d already installed but never ...

2026-07-06T12:28:02Z

In reply to nevent1q…hqg4
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2. Turn on the DRF-type stubs we’d already installed but never wired up. It was flagging serializer-field errors, and we never figured it out until now.

Yes, mypy is slow, but I think there is value in running it on Django codebases!

It was also very useful to look at the false positives, and we ...

2026-07-06T12:28:02Z

In reply to nevent1q…etnw
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It was also very useful to look at the false positives, and we were able to make two changes that reduced them by half:

1. Stop type-checking test files. No true positives were ever caught by this, and dynamic attrs from baker/setUpTestData are a common source of false positives

We reviewed 4,978 mypy runs in our Django app: • 4,731 green ...

2026-07-06T12:28:02Z

We reviewed 4,978 mypy runs in our Django app:

• 4,731 green
• 246 failed

Of the 246 failures:
• 173 false positives
• 73 real issues
• 39 caught only by mypy and no other check!

Some noise, but it prevented real bugs from reaching production. 🎉

Our Go wrapper rebuilt an expensive index on every call. Python ...

2026-07-03T14:01:59Z

In reply to nevent1q…7z82
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Our Go wrapper rebuilt an expensive index on every call. Python version builds it at package build time.

Yes, we could fix the indexing problem, and then Go would be ~16x faster than Python (0.04ms vs 0.63ms), but we’ll happily trade 0.6ms to remove the whole Go-Python bridge.

Today I migrated some Go code to Python and made it 590x FASTER ...

2026-07-03T14:01:57Z

Today I migrated some Go code to Python and made it 590x FASTER 😎

After 9 meetups full of talks, lightning talks, and even ...

2026-06-29T08:00:06Z

After 9 meetups full of talks, lightning talks, and even lightning turtles, it's time for the Python Lisbon Meetup to take it easy.

Join us at Linha d'Água on Thursday to relax and enjoy the summer in Lisbon with Python friends 🐢

https://www.meetup.com/python-lisbon-meetup/events/315420890/

A bug that survived 15 years of upgrades. One of my servers lost ...

2026-06-08T08:57:00Z

A bug that survived 15 years of upgrades.

One of my servers lost DNS after every reboot. ping 8.8.8.8 worked; ping https://google.com didn't resolve. I'd been "fixing" it by hand-editing /etc/resolv.conf, which, of course, was reset on the next boot. 🙈

Turned out to be a config from 2010. I finally debugged it properly with Claude.

https://blog.pecar.me/the-15-year-old-iptables-rule-that-broke-my-dns

good point. I think the cooldown period works for regular updates ...

2026-06-06T12:05:53Z

In reply to nevent1q…a0zl
_________________________

good point. I think the cooldown period works for regular updates but not for security updates. If you are impacted by a security vuln you should upgrade immediately. That's not something you can easily automate though...

What you can do is set a lower cooldown period for packages you trust more. E.g. we have a general 3 day cooldown for all packages but 1 day for Django so that we bring in security updates the same week. We would patch immediately if the CVE was impacting us.

The Claude usage page is very confusing. Since Sonnet has a ...

2026-05-26T14:20:45Z

The Claude usage page is very confusing. Since Sonnet has a separate bar I thought I'd be able to switch to it after I max out Opus, but nope.

Of course this all makes sense if you actually read the tooltip/labels but who does that today anyway? 😅

Speaking about reading the labels. It says that I spent the limit ...

2026-05-26T14:20:45Z

In reply to nevent1q…up3r
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Speaking about reading the labels. It says that I spent the limit for this month but it's actually a weekly limit, lol.

Oh, I didn’t know GitHub doesn’t have pagination in the ...

2026-05-25T09:56:08Z

Oh, I didn’t know GitHub doesn’t have pagination in the Commits tab of a pull request. 😅

Make sure to always reuse your botoclients. Initializing a fresh ...

2026-05-22T13:58:56Z

Make sure to always reuse your botoclients. Initializing a fresh one on each task has A LOT of overhead!

Running Claude in a loop to push our test coverage. After 24+ ...

2026-05-20T13:56:06Z

Running Claude in a loop to push our test coverage.

After 24+ hours and 22,000 new lines of tests, coverage climbed from 92% to 95%. No clue if it’ll get merged, but it's a really fun experiment 👀

Fun fact, I was reviewing for 3 hours straight on Saturday while ...

2026-05-17T22:26:35Z

In reply to nevent1q…pmyx
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Fun fact, I was reviewing for 3 hours straight on Saturday while the Raglan surf competition was on. There was A LOT of waiting between sets, so I could focus on proposals for most of it!

Over the last week, I've been reviewing PyCon Portugal talk ...

2026-05-17T22:26:34Z

Over the last week, I've been reviewing PyCon Portugal talk and workshop proposals, and I just finished reviewing them all! 😎

Some really good ones in the mix that got me really excited about the conference in September. Make sure to grab your ticket!

https://2026.pycon.pt

here it is! https://blog.pecar.me/fedidevs-postmortem/

2026-05-13T09:21:12Z

In reply to nevent1q…70x4
_________________________

here it is! https://blog.pecar.me/fedidevs-postmortem/

when Claude figures out the root cause 😂

2026-05-13T08:46:55Z

In reply to nevent1q…l065
_________________________

when Claude figures out the root cause 😂

Fedidevs had quite an outage today. It went offline just as I ...

2026-05-13T08:38:57Z

Fedidevs had quite an outage today. It went offline just as I went to bed and I didn't see it until I woke up this morning 🫣

Still better uptime than GitHub 😅

dogs are the best!

2026-05-12T20:34:19Z

In reply to nevent1q…eyxv
_________________________

dogs are the best!

Months of training runs with my dog. Went solo today and broke ...

2026-05-12T20:30:10Z

Months of training runs with my dog. Went solo today and broke almost every PR I had. He’s the real coach 🐕

RE: https://fosstodon.org/@anze3db/116558364408886679 The supply ...

2026-05-12T09:13:20Z

RE: https://fosstodon.org/@anze3db/116558364408886679

The supply chain attack has now spread to PyPI:

mistralai: 2.4.6
guardrails-ai: 0.10.1

Pause your dependency updates or use package cooldowns (--uploaded-prior-to flag in latest pip)

Stay safe!

quoting
note1f24…nz9h

🚨 There was another supply chain attack, this time affecting tanstack npm packages. Make sure you haven't installed the compromised packages either in your CI or locally.

I would also hold off on updating any dependency for the next week or so until the dust settles from this.

Blog post with more information on all of this. Stay safe out there!

https://socket.dev/blog/tanstack-npm-packages-compromised-mini-shai-hulud-supply-chain-attack

🚨 There was another supply chain attack, this time affecting ...

2026-05-11T22:44:55Z

🚨 There was another supply chain attack, this time affecting tanstack npm packages. Make sure you haven't installed the compromised packages either in your CI or locally.

I would also hold off on updating any dependency for the next week or so until the dust settles from this.

Blog post with more information on all of this. Stay safe out there!

https://socket.dev/blog/tanstack-npm-packages-compromised-mini-shai-hulud-supply-chain-attack

Claude had to force-remove conflicting packages, reinstall the ...

2026-05-11T09:59:13Z

In reply to nevent1q…4q0c
_________________________

Claude had to force-remove conflicting packages, reinstall the Trixie versions, and use dpkg -i --force-overwrite where the metadata still disagreed about file ownership. I would have given up and reinstalled.

Full write-up in my latest blog post 👇

https://blog.pecar.me/letting-claude-upgrade-my-raspberry-pi/

I told Claude to upgrade my Raspberry Pi from Debian 12 to 13 and ...

2026-05-11T09:59:13Z

I told Claude to upgrade my Raspberry Pi from Debian 12 to 13 and went to enjoy my Sunday.

It wasn't an easy upgrade. apt kept tripping over Debian's t64 transition, but Claude managed to unstuck it. When I came back, the box rebooted cleanly into Debian 13. 😲

Meetup page for the event: ...

2026-05-04T08:49:39Z

In reply to nevent1q…fgxy
_________________________

Meetup page for the event: https://www.meetup.com/python-lisbon-meetup/events/314097850/

More info: https://python-lisbon-meetup.github.io/

We have another Python Lisbon Meetup coming up on Thursday 🐍 ...

2026-05-04T08:49:39Z

We have another Python Lisbon Meetup coming up on Thursday 🐍

This time Yulia will be giving a talk on strong and weak references!

See you on May 7 @ 19:00 at IST, Pavilhão de Matemática, room 3.10!

I haven't heard it until now but out of the box it seems to ...

2026-04-28T14:11:58Z

In reply to nevent1q…07ly
_________________________

I haven't heard it until now but out of the box it seems to have the same limitations as pyright, ty, pyrefly that I describe in the blog post.

With zuban I'm seeing over 7k type errors in my codebase where mypy + django-stubs has 0.

I'll play around a bit more with it when I have more time, but I think the general rule of the blog post still stands: You either choose completeness with mypy+django-stubs or you choose speed but then have to deal with attr-defined errors.

Finally wrote up my notes from DjangoCon Europe 2026 in Athens ...

2026-04-28T10:02:03Z

Finally wrote up my notes from DjangoCon Europe 2026 in Athens 🇬🇷

I climbed the Acropolis, ate great food, hung out with amazing people, gave a lightning talk, and fixed one regression in Django main during the sprints.

https://blog.pecar.me/djangocon-europe-2026/

With all the supply chain attacks going around, we have to be ...

2026-04-20T09:57:05Z

With all the supply chain attacks going around, we have to be very careful about how we update our dependencies. I've written a full blog post about it, but here is the TLDR:

1. Pin to hashes, not just versions
2. Automate the updates
3. Use dependency cooldowns

https://blog.pecar.me/how-to-safely-update-your-dependencies/

Everyone’s favorite web framework is now also in the gelato ...

2026-04-12T12:55:00Z

Everyone’s favorite web framework is now also in the gelato business 🤤

Another Python Lisbon Meetup in the books! Looking forward to the ...

2026-04-03T09:37:38Z

Another Python Lisbon Meetup in the books! Looking forward to the next one on May 7 👀

I'll be giving a talk about lazy imports at the next Python ...

2026-03-30T09:02:02Z

I'll be giving a talk about lazy imports at the next Python Lisbon Meetup!

See you there? 😀

https://www.meetup.com/python-lisbon-meetup/events/313903112/?eventOrigin=home_next_event_you_are_attending

With recent Python supply chain attacks (Trivy/LiteLLM), it’s ...

2026-03-25T15:11:50Z

With recent Python supply chain attacks (Trivy/LiteLLM), it’s worth mentioning uv’s `exclude-newer = "x days"` config.

It forces uv to only installs packages published more than x days ago, reducing risks since problematic packages should be yanked by then.

https://docs.astral.sh/uv/reference/settings/#exclude-newer

I wrote a post on how we tracked down slow imports in our Django ...

2026-03-23T10:59:03Z

I wrote a post on how we tracked down slow imports in our Django app, fixed them by making imports lazy, and added a lint check to prevent regressions.

Now I’m waiting for Python 3.15 to make all of this easier! 🚀

https://blog.pecar.me/speeding-up-django-startup-times-with-lazy-imports/

yes, lazy imports are used heavily in larger web applications. ...

2026-03-16T10:25:07Z

In reply to nevent1q…4d5a
_________________________

yes, lazy imports are used heavily in larger web applications. Although they are a double edged sword becasue they can offload slow imports into the request/response cycle. So in prod you usually have to then "warm up" the process before it starts serving requests.

In our case, most of those heavy imports are used by celery tasks so nothing to really no need to import them when starting the web server.

I agree. I would even go as far and say that imports should have ...

2026-03-15T22:21:55Z

In reply to nevent1q…2a5e
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I agree. I would even go as far and say that imports should have been lazy by default. But having the ability to opt into lazy imports by not needing to move imports into functions is going to be a great addition!

Can't wait for lazy imports in Python 3.15! I spent a bunch ...

2026-03-15T19:35:30Z

Can't wait for lazy imports in Python 3.15! I spent a bunch of time and tokens over the weekend inlining heavy imports so that they don't get loaded during initial start of a Django app.

The `https://manage.py check` command is now 3.8x faster (9.45s down to 2.48s).

cool talk, thanks for the link! I've also added it to the ...

2026-03-14T15:31:48Z

In reply to nevent1q…yeql
_________________________

cool talk, thanks for the link! I've also added it to the blog post.

I wrote a blog post about some of the options for adding type ...

2026-03-13T11:59:02Z

I wrote a blog post about some of the options for adding type checking to your Django project!

Historically, Django projects have been tough to type-check, but the future feels bright, especially if PEP 827 gets accepted!

https://blog.pecar.me/typing-your-django-project-in-2026/

Like pretty much everyone with a static blog site in the last 6 ...

2026-03-05T12:02:04Z

Like pretty much everyone with a static blog site in the last 6 months, I asked Claude to migrate it to a different static site generator.

Here's a blog post about it, along with some of my general thoughts on agentic code.

https://blog.pecar.me/agentic-adventures/

Hey all! It's almost time for the next Python Lisbon Meetup! ...

2026-02-27T12:46:31Z

Hey all! It's almost time for the next Python Lisbon Meetup! 🐍

On Thursday, pyctrl will be talking about exceptions. We'll cover the origin of exceptions, their usage in OOP, how best to manage them, and more. It's going to be exceptional! 💎

See you on Mar 5 @ 19:00 at IST, Pavilhão de Matemática, room ...

2026-02-27T12:46:31Z

In reply to nevent1q…ddf0
_________________________

See you on Mar 5 @ 19:00 at IST, Pavilhão de Matemática, room 3.10!

Check out our website for more info on how to join our community!

https://python-lisbon-meetup.github.io/

hey thank you for reaching out and sorry the follow button ...

2026-01-26T23:34:07Z

In reply to nevent1q…arad
_________________________

hey thank you for reaching out and sorry the follow button didn't work.

I see in the logs that the following the account failed because of a Mastodon API error, but I don't see what the API error was.

I've added some more logging that will hopefully give me a hint. Could you try to follow one or more accounts again?

Hey, yes I'm hoping to add support for pixelfed accounts ...

2026-01-23T11:02:18Z

In reply to nevent1q…5hg3
_________________________

Hey, yes I'm hoping to add support for pixelfed accounts eventually but I don't have a timeline.

Here is the GitHub issue about it: https://github.com/anze3db/fedidevs/issues/98

New board! ...

2025-12-21T16:33:56Z

New board!

Nice! I really like your solution for day 7. Very clean!

2025-12-14T22:57:04Z

In reply to nevent1q…xwsw
_________________________

Nice! I really like your solution for day 7. Very clean!

I wrote a blog post about this year's Advent of Code. I had a ...

2025-12-14T16:42:30Z

I wrote a blog post about this year's Advent of Code. I had a blast and I am already looking forward to 2026!

* All my Python solutions were under 1s using pure Python and 100ms with a little help from mypy/scipy
• The AoC community is the best ❤️

https://blog.pecar.me/advent-of-code-2025

I've finished #adventofcode 2025 and this is the first year ...

2025-12-12T13:50:57Z

I've finished #adventofcode 2025 and this is the first year that I managed to get all solutions under 100ms ⚡

All but two are under 10ms. Not bad for the slowest popular language out there 🐍, although I did have to use numpy a few times.

It has been 15 years since I joined GitHub 😱 ...

2025-12-07T09:43:03Z

It has been 15 years since I joined GitHub 😱

New release of adventofcode PyPI package today improves the ...

2025-12-07T06:40:37Z

New release of adventofcode PyPI package today improves the display of alternative solutions for each day:

1. Slower solutions are no longer counted in totals
2. Slower solutions are dimmed out

Why limit yourself to one #adventofcode solution per day? 😆

Happy solving! 🎄

I compared the first 4 #adventofcode solutions on two different ...

2025-12-04T13:49:32Z

I compared the first 4 #adventofcode solutions on two different CPUs.

* Rows with a red background are on 8x Intel(R) Core(TM) i7-10510U CPU @ 1.80GHz.
* Rows with a green background are on Apple M3 Max.

So if you want to be better at advent of code just get a better CPU? 😆

I wonder how long I'll be able to keep all the days green ...

2025-12-03T06:21:28Z

I wonder how long I'll be able to keep all the days green like this #adventofcode 🟢

Today I learned that you can use None when slicing a list in Python:
>>> [1,2,3][:None]
[1, 2, 3]
Useful to avoid the edge case where [:0] would give an empty list:
>>> [1,2,3][:0]
[]

Just launched version 25.4 of my adventofcode PyPI package! 🚀 ...

2025-12-02T09:00:27Z

Just launched version 25.4 of my adventofcode PyPI package! 🚀

25.4 adds a `adventofcode run` command that removes the ugly boilerplate that you had to have in your puzzle files until now!

Before: After:

I'm using Python and also re-parsing the input for each step.

2025-12-02T07:18:40Z

In reply to nevent1q…d6vs
_________________________

I'm using Python and also re-parsing the input for each step.

Day 2 of #adventofcode kinda felt easier than day 1 or was it ...

2025-12-02T07:11:38Z

Day 2 of #adventofcode kinda felt easier than day 1 or was it just me?

I got to the solution fairly quickly but it was a bit slow. I then spent the next hour optimizing it and managed to make part 1 200x faster and part 2 500x faster 🎉

Day 1 of #adventofcode felt a bit harder than previous day 1 ...

2025-12-01T16:10:11Z

Day 1 of #adventofcode felt a bit harder than previous day 1 puzzles. It took me way longer to figure out part 2 than I care to admit, but I'm blaming this on my sleepy brain 😅

My code took 1.1ms for both parts without any perf optimizations 🎉

Eleven more to go!

6 hours until the first advent of code puzzle unlocks. Who's ...

2025-11-30T23:02:19Z

6 hours until the first advent of code puzzle unlocks. Who's going to participate this year? 🎄

I've also added a benchmarking utility so that I can have a ...

2025-11-30T12:24:16Z

In reply to nevent1q…tscw
_________________________

I've also added a benchmarking utility so that I can have a fancy README with all the run times 😎

RE: https://mastodon.social/@nixCraft/115633791960750253 So this ...

2025-11-29T20:12:54Z

RE: https://mastodon.social/@nixCraft/115633791960750253

So this is the strategy AGI came up with for generating investment returns? 😆

https://www.youtube.com/shorts/pLnyjxgFxew
nostr:note1dvnaf496fsqa4tav9htzdd5vew9980nagvf85l04lr2mvezk4t7sjqdzv4

I've just published a new version of my adventofcode PyPI ...

2025-11-29T16:55:30Z

I've just published a new version of my adventofcode PyPI package, just in time for Advent of Code that starts in 36 hours! 🎉

I've added a command line tool that helps you scaffold all the files for puzzle days because I got annoyed by copy pasting the same file each time!

https://pypi.org/project/adventofcode/

Carlton's proposal to move Django to an annual release cycle ...

2025-10-31T12:00:48Z

Carlton's proposal to move Django to an annual release cycle makes all the sense.

The x.2 LTS releases always felt wrong to me since it has always been much easier and safer to upgrade each version rather than doing the LTS to LTS leap in one go.

https://buttondown.com/carlton/archive/an-annual-release-cycle-for-django/

It's always DNS: > We have identified a potential root ...

2025-10-20T09:22:13Z

In reply to nevent1q…8wxz
_________________________

It's always DNS:

> We have identified a potential root cause for error rates for the DynamoDB APIs in the US-EAST-1 Region. Based on our investigation, the issue appears to be related to DNS resolution of the DynamoDB API endpoint in US-EAST-1

us-east-1 is down, happy Monday! ...

2025-10-20T08:55:09Z

us-east-1 is down, happy Monday!

I had a memory issue with Django's bulk_update queryset ...

2025-10-13T09:57:02Z

I had a memory issue with Django's bulk_update queryset method.

The TLDR version is that bulk_update prepares all the update statements in advance (even when batch_size is set) which can use more memory than expected.

Details and a solution in the blog:
https://blog.pecar.me/django-bulk-update-memory-issue

I have not. Can it generate a count from a left outer join?

2025-10-11T11:16:02Z

In reply to nevent1q…3gqd
_________________________

I have not. Can it generate a count from a left outer join?

not the first read model, not even on this particular project but ...

2025-10-11T11:11:09Z

In reply to nevent1q…c244
_________________________

not the first read model, not even on this particular project but it’s always fun to see how much overhead a left outer join can cause.

I've improved the performance of the starter packs list query ...

2025-10-11T09:23:55Z

I've improved the performance of the starter packs list query from about 200ms to 2ms. 🎉

The trick was to stop dynamically computing the number of accounts in a starter pack and instead precompute it in a column.

A bit more work on each update, but worth it!

Yesterday, Python 3.14 was released, and today all of my Django ...

2025-10-08T08:49:22Z

Yesterday, Python 3.14 was released, and today all of my Django side projects are running on 3.14. 🎉

The upgrade didn't require any code changes on my part, but I did see a few return statements in the finally block SyntaxWarnings in a few dependencies.

my existing Gunicorn config was very basic: proc_name = ...

2025-09-29T15:19:09Z

In reply to nevent1q…sp6l
_________________________

my existing Gunicorn config was very basic:

proc_name = "fedidevs"
bind = "unix:fedidevs.sock"
workers = 4
threads = 4

So it was easy to translate to Granian's command line arguments:

granian \
--interface wsgi fedidevs.wsgi:application \
--process-name fedidevs \
--uds fedidevs.sock \
--workers 4 \
--blocking-threads 4

(I've added this to the article since I think it's worth seeing the comparison, thank you for the idea!).