fast-roman-rs: fast Roman numerals for Python with Rust

Rust-backed drop-in replacement distribution for the frozen roman==5.2 package.

It preserves the roman Python API and CLI while using a PyO3 Rust core on compatible CPython platforms. A same-version pure-Python wheel keeps the frozen contract available on supported PyPy and other platforms.

Install fast-roman-rs

pip install fast-roman-rs

import roman

assert roman.toRoman(972) == "CMLXXII"
assert roman.fromRoman("cMlxxii") == 972

The installed namespace, function signatures, exception hierarchy, regex globals, typing marker, and roman console command follow upstream 5.2. CPython selects a PyO3 abi3 wheel where available; PyPy and unsupported platforms use the same-version pure-Python fallback.

Roman numeral CLI

roman 972
roman -r cMlxxii

Migrate from roman 5.2

Remove the upstream distribution, install the replacement, and keep application imports unchanged:

python -m pip uninstall roman
python -m pip install fast-roman-rs

Do not install both distributions into the same environment because both own the roman namespace and console script.

Roll back

python -m pip uninstall fast-roman-rs
python -m pip install roman==5.2

Compatibility and verification

See COMPATIBILITY.md for the executable contract and UPSTREAM-CONTRACT.md for immutable upstream evidence.

Benchmark evidence

See BENCHMARK.md. Measurements are published only after semantic equality and are scoped to the exact artifact and host.

Project links

Data verified by PyPI on Aug 12, 2026
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Latest release

1 maintainer

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Credits

Author: fast-roman-rs contributors

GitHub Statistics

Data verified by PyPI on Aug 12, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

ZPL-2.1
View SPDX License List

Requires

Python >=3.10

Provides Extra

test

Tags

roman roman-numerals conversion pyo3 rust drop-in-replacement

Classifiers

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