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`.pyx`

2 claimants 2 primary 0 secondary shared primary (2)

SWH popularity

Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.

981.7K

total files

312.0K

first seen 2021–2025 (31.8%)

2019

median year (half its files since)

Case variants in archive: .pyx (981.6K), .pyX (30), .PYX (2) — aggregated above.

Attribution status

This extension is attributed to Cython; Pyrex as primary by 3 authoritative claims.

Authoritative sources: ✓ Linguist ✓ Pygments ✗ Wikidata · no claim △ Wikipedia · secondary

Disagree or have a correction? Open a labelling issue.

Claimants (4)

Languages that list .pyx among their extensions. Strength reflects whether the upstream source treated it as their primary extension.

Language	Source	Strength
Cython	linguist	primary
Cython	pygments	primary
Pyrex	pygments	primary
Cython	wikipedia	proposed

Wikidata says… (1)

File formats, image formats, audio codecs and other non-PL entities that claim .pyx on Wikidata (property P1195) or in the Wikipedia infobox. Source: data/derived/external_extension_index.csv. Click Use as new PL on any row to open the Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata URL, and this extension — one submission creates the PL + claim.

Right entry isn't listed? Add manually ↗

Format	Class (Wikidata `P31`)	Suggested label	MIME	Notes	Action
Pyrex Source Code File Q127378050 file format	file format	—	`—`	—	Use as new PL ↗

SWH-mined examples (1)

Real archived programs with this extension, byte-verified against the SWH archive, grouped by predicted language and by how the prediction was made. Useful for deciding what this extension actually is when the attribution is uncertain.

unclassified (1) — 1 via fallback

nucname.pyx · 18084 B · seen 265× in SWH

predicted: unclassified via fallback

swh:1:cnt:579132b92c17ba2624a5411200a75127d543c881;origin=https://github.com/cyclus/cyclus;anchor=swh:1:rev:3180019432966ea76eb84b3e83ad3a0d41284bc5;path=/cyclus/nucname.pyx

Open in SWH · Raw bytes