[FSSDK-12276] update: replace flake8 with ruff

.github/workflows/python.yml

@@ -33,17 +33,10 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: '3.12'
-      # flake8 version should be same as the version in requirements/test.txt
-      # to avoid lint errors on CI
-    - name: pip install flak8
-      run: pip install flake8>=4.1.0
-    - name: Lint with flake8
-      run: |
-        flake8
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Install Ruff
+      run: pip install ruff>=0.15.0
+    - name: Lint with Ruff
+      run: ruff check .
 
   integration_tests:
     uses: optimizely/python-sdk/.github/workflows/integration_test.yml@master

CONTRIBUTING.md

@@ -15,7 +15,7 @@ Development process
 2.  Please follow the [commit message guidelines](https://github.com/angular/angular/blob/master/CONTRIBUTING.md#-commit-message-guidelines)
     for each commit message.
 3.  Make sure to add tests!
-4.  Run `flake8` to ensure there are no lint errors.
+4.  Run `ruff check .` to ensure there are no lint errors.
 5.  `git push` your changes to GitHub.
 6.  Open a PR from your fork into the master branch of the original
     repo.
@@ -34,12 +34,12 @@ Pull request acceptance criteria
     -   Tests are located in `/tests` with one file per class.
 -   Please don't change the `__version__`. We'll take care of bumping
     the version when we next release.
--   Lint your code with Flake8 before submitting.
+-   Lint your code with Ruff before submitting.
 
 Style
 -----
 
-We enforce Flake8 rules.
+We enforce Ruff linting rules (Flake8-equivalent: pycodestyle + Pyflakes).
 
 License
 -------

requirements/test.txt

@@ -1,5 +1,5 @@
 coverage
-flake8 >= 4.0.1
+ruff >= 0.15.0
 funcsigs >= 0.4
 pytest >= 6.2.0
 pytest-cov

ruff.toml

@@ -0,0 +1,38 @@
+# Ruff configuration
+# https://docs.astral.sh/ruff/configuration/
+
+line-length = 120
+target-version = "py39"
+
+exclude = [
+    ".git",
+    ".venv",
+    "__pycache__",
+    "build",
+    "dist",
+    "*.egg-info",
+    "*virtualenv*",
+    "optimizely/lib/pymmh3.py",
+    "tests/testapp/application.py",
+]
+
+[lint]
+# Flake8-equivalent rules:
+# E, W = pycodestyle (style errors & warnings)
+# F = Pyflakes (logic errors, undefined names, unused imports)
+select = ["E", "W", "F"]
+
+# Match current flake8 ignores
+# E722 - do not use bare 'except'
+ignore = ["E722"]
+
+# Allow autofix for all rules
+fixable = ["ALL"]
+unfixable = []
+
+[lint.per-file-ignores]
+# Ignore unused imports in __init__ files
+"__init__.py" = ["F401"]
+
+[lint.isort]
+known-first-party = ["optimizely"]