Bartosz Sławecki

The Python programming language

Memorize HTTP codes with an interactive http.cat game

My personal dotfiles managed with YADM.

Python REPL RC manager that records reloadable imports

Model-based, alternative interface to context variables

Create Python variables on the fly.

Repo bundling major type checkers so that I can grep stuff for the actual state more easily

No description.

The new REPL for Python 0.9.1

Reuse type arguments explicitly passed at runtime to a generic class before instantiating.

CPython worktree manager for my personal work on CPython (WIP)

Agent-assisted maintainership and development framework for Apache projects — Triage and Drafting (agent-authored fixes with human review); Mentoring, Pairing (developer-side dev-cycle), and Auto-merge on the roadmap.

Website for Apache Magpie — agent-assisted repository maintainership and development.

Stack-based compiler backend

https://johnslavik.com, https://ilikepython.com, https://ilikerust.com, https://ilikeprogramming.com, https://nawczoraj.com

AI agent toolkit: coding agent CLI, unified LLM API, TUI & web UI libraries, Slack bot, vLLM pods

Collection of library stubs for Python, with static types

🐍🍒⛏ Utility script for backporting/cherry-picking CPython changes from master into one of the maintenance branches.

Claude skill for managing development workspaces

Strip AI-writing tells from prose. An Agent Skill cooked from Wikipedia's 'Signs of AI writing' article.

Agent Skill that turns docs, prompts, transcripts, or anything else into one or more working Agent Skills.

Python Enhancement Proposals

Datadog Python APM Client

Backlog of the things I want to do in CPython next

A newsletter all about Python core development

A monorepo of Git plugins I use to speed up my work (wip)

Conveniently read single char inputs in the console.

Airflow is cool!

The property-based testing library for Python

My skills will be here!

Get your ducks in a row — a TUI for managing AI agent skills/mcps across projects

3 random lessons from open source

Papers for R&D ideas

The Python developer's guide

A minimal, secure Python interpreter written in Rust for use by AI

Strip away the useful info from tracebacks, by default

WIP

Vibe-coded tool for watching a batch job happen live

My personal CPython productivity tool

A utility to build any commit of CPython, even with the JIT enabled

The Batteries-Detachable Web Framework

Ancient J2A tools that magically work

Production-ready community-driven modern Stripe-like API versioning in FastAPI

No description.

FastAPI framework, high performance, easy to learn, fast to code, ready for production

Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documentation/SubmittingPatches procedure for any of your improvements.

Empowering everyone to build reliable and efficient software.

The Prometheus monitoring system and time series database.

Mirror of Apache Kafka

Production-Grade Container Scheduling and Management

Run stuff, again

I'll implement a frontend for viewing posts one day

Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch

The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.

Memray is a memory profiler for Python

GenAI Agent Framework, the Pydantic way

A collection of JSON schema files including full API

No description.

Data validation using Python type hints

Like `typing._eval_type`, but lets older Python versions use newer typing features.

Runtime checks for typeshed

No description.

Toy linker in Rust

Logic framework built for fun

egraphs + datalog!

egg is a flexible, high-performance e-graph library

Python bindings for the egglog rust library

Gathering the interesting papers about formal semantics

User-land execve as a library (WIP)

Automatic Changelog generator using Jinja2 templates.

A simple task runner.

Copier template for Python projects managed by uv.

Nothing interesting here

I cannot believe this is not lazy imports!

A singledispatch() for arguments that are classes annotated as specific types.

Fast RDF serialization for Python

PyPy fork with py3.11 as the default branch

All my talks

Do you understand f-strings?

Build a Jekyll blog in minutes, without touching the command line.

A memory benchmarking and analysis tool for CPython development

Linux kernel source tree

Optional static typing for Python

Can you write this in one line?

Study project from hyperskill.org

No description.

Prettier is an opinionated code formatter.

Home of the WebKit project, the browser engine used by Safari, Mail, App Store and many other applications on macOS, iOS and Linux.

Skeleton is an adaptive design system powered by Tailwind CSS.

Utilities to execute code blocks in Markdown files.

Minimalistic website for the best math YouTuber

No description.

A Python type checker

Invalidate typing.NamedTuple subclasses' subclasses.

Jelly's website and documentation

RDFLib is a Python library for working with RDF, a simple yet powerful language for representing information.

Protocol Buffers and gRPC specifications for the Jelly protocol

JVM (Scala) implementation of Jelly