January 19, 2026
Regex vs translate: FIGHT!
How we made Python's packaging library 3x faster
Faster installs, fewer regex fights — commenters cheer speed hacks
TLDR: Python’s core packaging library — used by pip — just got much faster, with up to 3x speedups in key checks. Commenters linked to past debates and reignited the “use translate, not regex” optimization tussle, celebrating practical gains that could make everyday installs noticeably quicker for everyone.
Python’s behind-the-scenes hero just got a glow-up: the "packaging" library that powers pip (the tool that installs Python apps) now reads versions up to 2x faster and version rules up to 3x faster, with some tasks hitting 5x. It’s landing in packaging 26.0rc1 after a deep dive using Python 3.15’s new profiler and real-world data from PyPI. Translation: faster installs and snappier dependency checks for pretty much everyone who uses Python.
But the real show is in the comments. One early voice, zahlman, swooped in with a callback to the last big thread — the sequel energy is real. Then came the micro-optimization heat: [djoldman] spotlighted a classic speed trick — using string “translate” over regular expressions — with a knowing wink that “translate can be wildly fast.” Cue the regex vs translate cage match jokes and “ship it” memes.
The vibe? Equal parts “this will save hours across the internet” and “tell me exactly how you shaved those milliseconds.” The authors even teased clever trade-offs, like moving some costs from object creation to first comparison to save work overall. For non-nerds: you won’t see it, you’ll just feel it — pip gets out of your way faster, and the commentariat gets fresh ammo for their favorite performance debates.
Key Points
- •Packaging 26.0rc1 delivers speedups: Versions up to 2x faster, SpecifierSets up to 3x faster, and some operations up to 5x.
- •Optimizations were guided by Python 3.15’s statistical profiler and analysis of metadata from all packages on PyPI.
- •Micro-benchmarks were built with asv and executed using Python 3.14 from uv on an M1 Mac Mini, with results scaled to packaging 25.0.
- •A key change defers creation of a Version comparison tuple until the first comparison, improving typical-case performance as many Versions are never compared.
- •Past regressions in SpecifierSet construction (including nested NamedTuple overhead) were fixed; __str__ handling and Version–string round-trips were optimized.