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CPython internals

Ruff 0.8 Replaced Black, isort, and Flake8 in Our Monorepo
14 mins read

Ruff 0.8 Replaced Black, isort, and Flake8 in Our Monorepo

  • Automation
April 11, 2026April 19, 2026 Nia OkoroTagged CPython internals, DuckDB python, Free threading, GIL removal, Ibis framework, Marimo notebooks, Mojo language, Polars dataframe, Python JIT, Rust Python

A single ruff check –fix and ruff format pair now covers what used to be three separate pre-commit hooks: Black for formatting, isort for import.

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Ruff 0.6 Replaced Black and isort in Our Monorepo Last Week
14 mins read

Ruff 0.6 Replaced Black and isort in Our Monorepo Last Week

  • Code Quality
April 11, 2026April 19, 2026 Mateo VargasTagged CPython internals, DuckDB python, Free threading, GIL removal, Ibis framework, Marimo notebooks, Mojo language, Polars dataframe, Python JIT, Rust Python

The switch took one afternoon and one follow-up PR. A 180-package Python monorepo that had been running black , isort , and flake8 on every pre-commit.

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Python JIT: practical notes from production
12 mins read

Python JIT: practical notes from production

  • AI/ML
April 9, 2026April 9, 2026 Silas MontgomeryTagged CPython internals, DuckDB python, Free threading, GIL removal, Ibis framework, Marimo notebooks, Mojo language, Polars dataframe, Python JIT, Rust Python

The experimental copy-and-patch JIT landed in CPython 3.13 behind the –enable-experimental-jit build flag, and by 3.14 it is stable enough to enable on.

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Step-by-Step Tutorial: Writing Python Extensions in Rust With PyO3
15 mins read

Step-by-Step Tutorial: Writing Python Extensions in Rust With PyO3

  • CPython Internals
April 6, 2026 Mateo VargasTagged CPython internals

I hit a massive performance wall last Tuesday. I was tasked with parsing a 50GB dataset of nested JSON logs for a cybersecurity client doing malware.

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Python’s Reference Counting Has Changed (And You Probably Missed It)
11 mins read

Python’s Reference Counting Has Changed (And You Probably Missed It)

  • Data Engineering
January 27, 2026April 19, 2026 Nia OkoroTagged CPython internals

Well, that’s not entirely accurate — I actually spent most of last Tuesday staring at a flame graph that absolutely refused to make sense.

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