Author | Lightnews

Jamie Chang @changs.co.uk · 8d

Lazy imports in #Python are useful but limited by obscuring of typing information. In my latest blog post, I discuss a method to create typing information that more people should know about.

blog.changs.co.uk/fixing-lazy-...

Fixing lazy imports: Generating Static Types Dynamically

So I've just released a package called lazy-helper. This comes as lazy loading has been a hot topic once again due to the proposal PEP-810. Using...

blog.changs.co.uk

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Reposted by Jamie Chang

Christopher Trudeau @trudeau.dev · 13d

On this week's episode, @digiglean.bsky.social and I talk about loads of PEPs, more 3.14 news, and discuss what it means to have good engineering taste.

With content from: @brianokken.bsky.social @miguelgrinberg.com @changs.co.uk @davepeck.org and others not on the 🦋

Episode #271: Benchmarking Python 3.14 & Enabling Asyncio to Scale – The Real Python Podcast

How does Python 3.14 perform under a few hand-crafted benchmarks? Does the performance of asyncio scale on the free-threaded build? Christopher Trudeau is back on the show this week, bringing another…

buff.ly

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Reposted by Jamie Chang

Hugo van Kemenade @hugovk.dev · 18d

I benchmarked --help on a CLI with the ref implementation for PEP 810 (lazy imports).

Because my CLI moved imports into functions just before they get used, I got a speedup of x1.3.

Then I moved all the imports to the top like normal, and got a speedup of x2.9!

hugovk.dev/blog/2025/la...
#Python

Three times faster with lazy imports

hugovk.dev

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Jamie Chang @changs.co.uk · 27d

To celebrate the release of #Python 3.14| look at the often overlooked #asyncio changes:

blog.changs.co.uk/python-314-3...

Python 3.14: 3 Asyncio Changes

Python 3.14 was officially released on October 7th. There are a lot of new features and I've covered some of them before in: Python 3.14: 3...

blog.changs.co.uk

Reposted by Jamie Chang

Thomas Wouters @yhg1s.bsky.social · Oct 3

Let me post a *non*-subskeet for once... We made a thing!

discuss.python.org/t/pep-810-ex...

#Python #PEP

PEP 810: Explicit lazy imports

👋 Hi everyone, We are very exited to share with you PEP 810: Explicit lazy imports: We’re proposing an opt-in lazy import syntax that defers module loading until first use, aiming for faster startup,...

discuss.python.org

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Reposted by Jamie Chang

Real Python @realpython.com · Sep 16

Python 3.14: 3 Smaller Features #python

With a jam packed 3.14 release around the corner, it's also important to look at the smaller features coming to Python

blog.changs.co.uk

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Jamie Chang @changs.co.uk · Sep 15

New blog post about measuring the speed and memory performance on different asyncio baackpressure solutions.

blog.changs.co.uk/asyncio-back...

#python #asyncio

Asyncio backpressure - follow up

Previously when discussing asyncio backpressure I've made some claims that were not necessarily complete. I said: It works well for 100s of urls...

blog.changs.co.uk

Jamie Chang @changs.co.uk · Sep 11

I'm excited to see UUID V7 being supported more universally.

For databases, UUID 7 combines the flexibility and security of UUID 4 with time based ordering making it a great choice for IDs

Hugo van Kemenade @hugovk.dev · Sep 11

What's New in Python 3.14:

* Support UUID versions 6, 7, & 8 via uuid.uuid6(), uuid.uuid7(), & uuid.uuid8()

* uuid.NIL and uuid.MAX represent Nil and Max UUID formats

* Generate multiple UUIDs at once via python -m uuid --count

docs.python.org/3.14/whatsne...
#Python #Python314 #UUID #RFC9652

What’s new in Python 3.14

Editor, Hugo van Kemenade,. This article explains the new features in Python 3.14, compared to 3.13. For full details, see the changelog. Summary – release highlights: Python 3.14 will be the lates...

docs.python.org

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Jamie Chang @changs.co.uk · Sep 2

I had a similar quest to find a truly async file API recently and found github.com/qweeze/uring...

GitHub - qweeze/uring_file: Asynchronous file I/O with io_uring and asyncio

Asynchronous file I/O with io_uring and asyncio. Contribute to qweeze/uring_file development by creating an account on GitHub.

github.com

Jamie Chang @changs.co.uk · Jul 14

Python 3.14: 3 smaller features share.google/j0VSOzZH2lck...

Python 3.14: 3 smaller features

Python 3.14 is just around the corner and it's jampacked with huge updates: Free threading and multiple interpreters? Template strings But as with...

share.google

Reposted by Jamie Chang

Simon Willison @simonwillison.net · Jun 16

If you use "AI agents" (LLMs calling tools in a loop) you need to be aware of the Lethal Trifecta

Combine access to private data, exposure to untrusted content and the ability to externally communicate and an attacker can trick the system into stealing your data simonwillison.net/2025/Jun/16/...

The lethal trifecta for AI agents: private data, untrusted content, and external communication

If you are a user of LLM systems that use tools (you can call them “AI agents” if you like) it is critically important that you understand the risk of …

simonwillison.net

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Jamie Chang @changs.co.uk · Jun 5

#MCP is here to stay, so I tried implementing something slightly more useful than a weather tool. See how you can use custom MCP servers to help with your github workflow:
blog.changs.co.uk/first-look-a...

First Look at MCP

Previously I've played with tool calling in Langchain and Python sandboxes. But recently MCP (Model Context Protocol) is front and center. So I...

blog.changs.co.uk

Jamie Chang @changs.co.uk · May 29

Quick look at the state of free-threading in #python 3.14 beta

blog.changs.co.uk/python-314-s...

Free threading and subinterpreter performance in 3.13 vs 3.14

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Jamie Chang @changs.co.uk · May 7

Python3.14 beta 1 is out today, I go over how to use and abuse the new t-strings:

blog.changs.co.uk/t-strings-th...

t-strings: the good and the ugly

This one's hot off the press as the first beta for Python 3.14 (aka. π-thon) has hit. We're looking at a chunky release with a lot of new...

blog.changs.co.uk

Reposted by Jamie Chang

Brett Cannon @brettcannon.fosstodon.org.ap.brid.gy · Apr 10

t-strings are coming!

https://peps.python.org/pep-0750/

https://discuss.python.org/t/pep750-template-strings-new-updates/71594/130

PEP 750 – Template Strings | peps.python.org

This PEP introduces template strings for custom string processing.

peps.python.org

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Reposted by Jamie Chang

Real Python @realpython.com · Mar 13

My SQLAlchemy Cookbook #python

The post contains an embedded JupyterLite notebook containing a cookbook for SQLAlchemy. It focuses on the patterns you use in everyday ORM coding.

blog.changs.co.uk

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Jamie Chang @changs.co.uk · Mar 12

I've been unknowingly building DSLs using operators in #Python. Here I walkthough how you might do the same!

blog.changs.co.uk/building-a-d...

Building a DSL with Python Operators

I've been a little obsessed with operator overloading lately. First using |= in sqlalchemy-builder and then using | and @ in better-functools. I...

blog.changs.co.uk

Reposted by Jamie Chang

Real Python @realpython.com · Mar 10

Customising Pattern Matching Behaviour #python

Jamie has been doing the [Advent of Code](https://adventofcode.com/) and two techniques that come up a lot in Python are iteration and pattern matching. This post talks about how they don't work well together and what you can do about it.

blog.changs.co.uk

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Jamie Chang @changs.co.uk · Mar 9

Check out my blog post on functional programming in Python, where I talk a bit more about my new #Python package blog.changs.co.uk/better-funct...

better-functools: Python functional fun

I recently put some effort into creating better-functools. It's a package that adds some tooling for functional programming in Python. And allows...

blog.changs.co.uk

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Jamie Chang @changs.co.uk · Mar 4

Been a little obsessed with #ocaml lately, so I've tried to bring some of #functional ergonomics into #Python.

Checkout my new package better-functools
pypi.org/project/bett...

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Jamie Chang @changs.co.uk · Feb 6

TIL: though functools.partial can't be expressed using #Python types, both pyright and mypy support it fully.
pyright-play.net?pythonVersio...

Pyright Playground

pyright-play.net

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Jamie Chang @changs.co.uk · Feb 3

New blog post!

Do you use #sqlalchemy? Have you run into this issue? #Python
blog.changs.co.uk/sqlalchemy-f...

Sqlalchemy Footgun: Discarding the statement

This one has frustrated me for a while. It starts off with a REST API route. For example in fastAPI @app.get(

blog.changs.co.uk

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Reposted by Jamie Chang

Charlie Marsh @crmarsh.com · Jan 29

We’re building a new static type checker for Python, from scratch, in Rust.

From a technical perspective, it’s probably our most ambitious project yet. We’re about 800 PRs deep!

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Jamie Chang @changs.co.uk · Jan 25

I love this almost completely useless graphql page where it shows you all the cool tools but doesn't give you any links to them.
graphql.org/community/to...

Tools and Libraries | GraphQL

A collection of tools and libraries for GraphQL

graphql.org

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