suuid

Semantic, filename- and S3-safe UUIDs.

A SUUID is a 3-part identifier you can use directly as an S3 object key, a filename, or a database column name:

<ClassName>__<safe_name>__<huuid>

Data__messung_2026_csv__9e51448c57ab5ef1b92d0c27f554a49e
└─ class    └─ readable name   └─ 32-char hex uuid

• ClassName — the object/type class, case preserved ([A-Za-z0-9_]).
• safe_name — a normalised human label ([a-z0-9_], no leading/trailing _).
• huuid — a 32-char lowercase hex UUID.

The separator is exactly __ and no component contains __ or an edge _, so a SUUID parses back into its three parts unambiguously.

Why

• Safe as a filename / S3 key. Only [A-Za-z0-9_] after the class, no spaces, no special characters — works on Linux, Windows, S3 and as a DB identifier.
• Length-bounded. Every sname is ≤ 254 characters, so the metadata sibling key — sname + "_" — still fits the 255-char limit. Store an object under sname and its metadata under meta_name.
• Reproducible. Name- and content-deterministic modes mean the same input always yields the same identifier, on every run and machine. The rules are frozen and versioned (NORMALIZATION_SPEC).

Install

uv add suuid
# or
uv pip install suuid

Usage

from suuid import SUUID

# Name-deterministic: same (class, name) -> same id, everywhere.
sid = SUUID.from_name("Data", "Messung 2026.csv")
sid.sname        # 'Data__messung_2026_csv__9e51...'
sid.meta_name    # 'Data__messung_2026_csv__9e51..._'  (metadata object key)
sid.huuid        # '9e51448c57ab5ef1b92d0c27f554a49e'
sid.did          # 'did:suuid:Data__messung_2026_csv__9e51...'

# Content-deterministic: same bytes -> same id (content-addressed, dedup).
SUUID.from_content("Doc", "spec.pdf", b"...bytes...")
SUUID.from_file("Doc", "spec.pdf")

# Random (non-reproducible).
SUUID.random("Run", "nightly")

# Round-trips.
SUUID.from_sname(sid.sname) == sid
SUUID.from_compact_token(sid.compact_token) == sid
SUUID.from_dict(sid.to_dict()) == sid

CLI

suuid mint --class Data --name "Messung 2026.csv"
suuid mint --class Doc  --name spec.pdf --mode content --content-file spec.pdf
suuid mint --class Run  --name nightly  --mode random
suuid parse --sname "Data__messung_2026_csv__9e51..."
suuid mint  --class Data --name x --json     # full to_dict() as JSON

The three modes

In content mode the name stays human-readable; only the huuid is derived from the content hash (also exposed as content_hash, full sha3-256 hex).

Length budget

class (≤64) + "__" (2) + safe_name (≤154) + "__" (2) + huuid (32)  =  ≤ 254
                                                          + "_"     =  ≤ 255   (meta_name)

Development

uv sync
uv run pytest
uv run ruff check

Releasing

Published to PyPI via Trusted Publishing on GitHub Release — see RELEASING.md.

License

MIT — see LICENSE.