fix: resolve CI linting errors (C901, E501, E741, F841)

.gitignore

@@ -1,7 +1,43 @@
-*.pyc
+# Python
 __pycache__/
-*.egg-info/
-dist/
+*.py[cod]
+*$py.class
+*.so
+.Python
 build/
-.env
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual Environment
+venv/
+env/
 .venv/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Testing
+.coverage
+.pytest_cache/
+htmlcov/
+*.cover