Switch repository formatting to ruff

.gitattributes

@@ -1,2 +1 @@
 *.ipynb linguist-language=Python
-spopt/_version.py export-subst

.github/CONTRIBUTING.md

@@ -5,7 +5,5 @@ Thank you for your interest in contributing! We work primarily on Github. Please
 
 ## Style and format
 
-This project utilizes:
-* [`black`](https://black.readthedocs.io/en/stable/) for formatting;
-* [`ruff`](https://docs.astral.sh/ruff/) for linting; and
-* [`pre-commit`](https://pre-commit.com) to check format and lint on commits prior to pull requests being made. 
+1. At the time of this writing, Python 3.10, 3.11, and 3.12 are the officially supported versions.
+2. This project implements the linting and formatting conventions of [`ruff`](https://docs.astral.sh/ruff/) on all incoming Pull Requests. To ensure a PR is properly linted and formatted prior to creating a Pull Request, [install `pre-commit`](https://pre-commit.com/#installation) in your development environment and then [set up the configuration of pre-commit hooks](https://pre-commit.com/#3-install-the-git-hook-scripts). 

.pre-commit-config.yaml

@@ -1,14 +1,10 @@
 files: "spopt\/"
 repos:
-  - repo: https://github.com/psf/black
-    rev: "23.11.0"
-    hooks:
-      - id: black
-        language_version: python3
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: "v0.1.6"
     hooks:
       - id: ruff
+      - id: ruff-format
 
 ci:
   autofix_prs: false

README.md

@@ -12,7 +12,7 @@
 [![codecov](https://codecov.io/gh/pysal/spopt/branch/main/graph/badge.svg)](https://codecov.io/gh/pysal/spopt)
 [![Documentation](https://img.shields.io/static/v1.svg?label=docs&message=current&color=9cf)](http://pysal.org/spopt/)
 [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 [![status](https://joss.theoj.org/papers/1413cf2c0cf3c561386949f2e1208563/status.svg)](https://joss.theoj.org/papers/1413cf2c0cf3c561386949f2e1208563)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.4444156.svg)](https://doi.org/10.5281/zenodo.4444156)
 

pyproject.toml

@@ -54,7 +54,7 @@ tests = [
     "pytest-cov",
     "pytest-xdist",
 ]
-dev = ["pre-commit"]
+dev = ["pre-commit", "ruff"]
 docs = [
     "nbsphinx",
     "numpydoc",
@@ -79,13 +79,9 @@ notebooks = [
 [tool.setuptools.packages.find]
 include = ["spopt", "spopt.*"]
 
-[tool.black]
-line-length = 88
-
 [tool.ruff]
 line-length = 88
 select = ["E", "F", "W", "I", "UP", "N", "B", "A", "C4", "SIM", "ARG"]
-target-version = "py310"
 exclude = ["spopt/tests/*", "docs/*"]
 
 [tool.ruff.per-file-ignores]

spopt/region/azp_util.py

@@ -8,7 +8,11 @@
 
 class AllowMoveStrategy(abc.ABC):
     def start_new_component(
-        self, initial_labels, attr, objective_func, comp_idx  # noqa: ARG002
+        self,
+        initial_labels,
+        attr,
+        objective_func,
+        comp_idx,  # noqa: ARG002
     ):
         """
         This method should be called whenever a new connected component is