cfractions

Summary

cfractions is a drop-in replacement for fractions module written using Python C API.

Main features are:

• speed & memory efficiency compared to pure-Python counterpart,
• full spectre of arithmetic & comparison operations,
• Python3.9+ support,
• PyPy support (by falling back to fractions.Fraction proxy).

---

In what follows python is an alias for python3.9 or pypy3.9 or any later version (python3.10, pypy3.10 and so on).

Installation

Install the latest pip & setuptools packages versions

python -m pip install --upgrade pip setuptools

User

Download and install the latest stable version from PyPI repository

python -m pip install --upgrade cfractions

Developer

Download the latest version from GitHub repository

git clone https://github.com/lycantropos/cfractions.git
cd cfractions

Install

python -m pip install -e .

Usage

>>> from cfractions import Fraction
>>> Fraction()
Fraction(0, 1)
>>> Fraction(1, 2)
Fraction(1, 2)
>>> Fraction(50, 100)
Fraction(1, 2)
>>> Fraction(0.5)
Fraction(1, 2)
>>> Fraction(1, 3) + Fraction(1, 6)
Fraction(1, 2)
>>> Fraction(3, 2) - 1
Fraction(1, 2)
>>> 1 - Fraction(1, 2)
Fraction(1, 2)
>>> Fraction(1, 3) * Fraction(3, 2)
Fraction(1, 2)
>>> Fraction(1, 3) / Fraction(2, 3)
Fraction(1, 2)
>>> Fraction(1, 6) * 3
Fraction(1, 2)
>>> Fraction(3, 2) / 3
Fraction(1, 2)
>>> str(Fraction(1, 2))
'1/2'

Development

Bumping version

Preparation

Install bump2version.

Pre-release

Choose which version number category to bump following semver specification.

Test bumping version

bump2version --dry-run --verbose $CATEGORY

where $CATEGORY is the target version number category name, possible values are patch/minor/major.

Bump version

bump2version --verbose $CATEGORY

This will set version to major.minor.patch-alpha.

Release

Test bumping version

bump2version --dry-run --verbose release

Bump version

bump2version --verbose release

This will set version to major.minor.patch.

Running tests

Install with dependencies

python -m pip install -e .[tests]

Plain

pytest

Inside Docker container:

• with CPython

  docker-compose --file docker-compose.cpython.yml up

• with PyPy

  docker-compose --file docker-compose.pypy.yml up

Bash script:

• with CPython

  ./run-tests.sh

  or

  ./run-tests.sh cpython

• with PyPy

  ./run-tests.sh pypy

PowerShell script:

• with CPython

  .\run-tests.ps1

  or

  .\run-tests.ps1 cpython

• with PyPy

  .\run-tests.ps1 pypy