Use flake8 in project

.github/workflows/pythonpackage.yml

@@ -1,7 +1,7 @@
 name: Python package
 
 on:
-  push: 
+  push:
     branches:
       - main
   pull_request:
@@ -17,22 +17,27 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
-      
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           pip install -e .[dev]
-      
+
       - name: Lint
         run: |
           black --check .
           mypy .
-      
+
+      - name: Optional linting
+        continue-on-error: true
+        run: |
+          flake8 .
+
       - name: Test with pytest
         run: |
           pytest

setup.cfg

@@ -11,6 +11,16 @@ no_strict_optional = True
 no_site_packages = True
 ignore_missing_imports = True
 
+[flake8]
+filename =
+    ./src/*,
+    ./tests/*,
+exclude = .git, __pycache__, *.egg-info, *.json, *.conf, *.env,
+per-file-ignores =
+    __init__.py: F401,
+ignore =
+    W503
+max-line-length = 88
 
 [tool:pytest]
 python_files = test_*.py

setup.py

@@ -45,6 +45,7 @@
     extras_require={
         "dev": [
             "black",
+            "flake8",
             "mypy",
             "myst-parser",
             "pytest-dotenv",