Switch to ruff

       because:
       1. it's faster (i.e., energy and time usages)
       2. it's more flexible (i.e., good for mental health)
       3. flake8 with Flake8-pyproject per-file-ignores with a comment per line wouldn't work à la:

per-file-ignores = [
    '**/__init__.py:F401',  # imported but unused
    # the following ignored rules allow for tabular data in the tests (mostly)
    'tests/test_*.py:E203',  # whitespace before ','
    'tests/test_*.py:E202',  # whitespace before ']'
    'tests/test_*.py:E126',  # continuation line over-indented for hanging indent
    'tests/test_*.py:E121',  # continuation line under-indented for hanging indent
    'tests/test_*.py:E128',  # continuation line under-indented for visual indent
    'tests/test_*.py:E231',  # missing whitespace after {',', ':'}
    # gallery examples also divert from standard style
    'docs/examples/*/*.py:E402',  # module level import not at top of file
]

Author: echedey-ls

.github/workflows/flake8-linter-matcher.json

@@ -0,0 +1,11 @@
+name: Lint Python code
+on:
+  pull_request:
+jobs:
+  flake8-linter:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+      - uses: astral-sh/ruff-action@v4.0.0
+        # https://github.com/astral-sh/ruff-action

.github/workflows/flake8.yml

@@ -88,28 +88,40 @@ all = ["pvlib[optional,doc,test,lint]"]
 Documentation = "https://pvlib-python.readthedocs.io/"
 "Source Code" = "https://github.com/pvlib/pvlib-python"
 
-[tool.flake8]
-ignore = [
-    'E201',  # Whitespace after '('
-    'E241',  # Multiple spaces after ','
-    'E226',  # Missing whitespace around arithmetic operator
-    'W503',  # Line break occurred before a binary operator
-    'W504',  # Line break occurred after a binary operator
-]
-per-file-ignores = [
-    '**/__init__.py:F401',
-]
-max-line-length = 79
+[tool.ruff]
+line-length = 79
 exclude = [
     # speed up .py files discovery
     '.git',
+    'build',  # created during local packaging
     # cache directories
     '__pycache__',
     # Virtual environment folders (same as in .gitignore)
     'venv', 'env',
     # built documentation generates .py examples files for their download, skip them
     'docs/sphinx/build',
+    'docs/sphinx/source/gallery',
+    # .ipynb outdated tutorials
+    'docs/tutorials/',
+]
+
+[tool.ruff.lint]
+ignore = [
+    'E201',  # Whitespace after '('
+    'E241',  # Multiple spaces after ','
+    'E226',  # Missing whitespace around arithmetic operator
 ]
+per-file-ignores = {
+    '**/__init__.py' = ['F401'],  # imported but unused
+    # the following ignored rules allow for tabular data in the tests (mostly)
+    'tests/**/test_*.py' = [
+        'E203',  # whitespace before ','
+        'E202',  # whitespace before ']'
+        'E231',  # missing whitespace after {',', ':'}
+    ],  
+    # gallery examples also divert from standard style
+    'docs/examples/**/*.py' = ['E402'],  # module level import not at top of file
+}
 
 [tool.setuptools]
 # do not include all non-python files in the bdist by default, but select them manually