decimo 0.1.0.dev0

Arbitrary-precision decimal and integer arithmetic for Python, powered by Mojo

decimo

Arbitrary-precision decimal and integer arithmetic for Python, powered by Mojo.

⚠️ Pre-Alpha / Placeholder release.
The Python bindings are under active development. A proper installable wheel is coming soon.
Full Mojo library is already available — see the main repository.

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What is decimo?

decimo is an arbitrary-precision decimal and integer library, originally written in Mojo.
This package exposes decimo's BigDecimal type to Python via a Mojo-built CPython extension module (_decimo.so), with a thin Python wrapper providing full Pythonic operator support.

from decimo import Decimal

a = Decimal("1.234567890123456789012345678901234567890")
b = Decimal("9.876543210987654321098765432109876543210")

print(a + b)   # 11.111111101111111110111111111111111111100
print(a * b)   # 12.193263111263526900...
print(a / b)   # 0.12499999...

Status

Feature	Status
Decimal (BigDecimal) arithmetic (+, -, *, /)	✅ Working
Comparison operators	✅ Working
Unary -, abs(), bool()	✅ Working
Pre-built wheels on PyPI	🚧 Coming soon
BigInt / Decimal128 Python bindings	🔜 Planned

Building from source

The extension requires Mojo and pixi:

git clone https://github.com/forfudan/decimo
cd decimo
pixi run buildpy
# .so is built at python/src/decimo/_decimo.so

Then install in editable mode:

pip install -e python/

Links

• GitHub: https://github.com/forfudan/decimo
• Changelog: https://github.com/forfudan/decimo/blob/main/docs/changelog.md
• Mojo library docs: https://github.com/forfudan/decimo/blob/main/docs/api.md