fix linter issues

Author: ohmayr

packages/django-google-spanner/setup.cfg

@@ -1,19 +1,22 @@
 [flake8]
 max-line-length = 79
-ignore =
-  E501  # line too long, defer to black
-  W503  # allow line breaks before binary ops
-  W504  # allow line breaks after binary ops
-  E203  # allow whitespace before ':' (https://github.com/psf/black#slices)
+
+# E501: line too long, defer to black/ruff
+# W503: allow line breaks before binary ops
+# W504: allow line breaks after binary ops
+# E203: allow whitespace before ':' (https://github.com/psf/black#slices)
+ignore = E501, W503, W504, E203
+
+# Exclude generated code and standard linting exemptions.
 exclude =
-  # Exclude generated code.
-  **/_build/**
+    **/_build/**,
+    __pycache__,
+    .git,
+    *.pyc,
+    conf.py
 
-  # Standard linting exemptions.
-  __pycache__,
-  .git,
-  *.pyc,
-  conf.py
+per-file-ignores =
+    django_spanner/__init__.py: E402, F401
 
 [isort]
 use_parentheses = True
@@ -23,4 +26,4 @@ include_trailing_comma = True
 force_grid_wrap = 0
 line_length = 79
 multi_line_output = 3
-ensure_newline_before_comments = True
+ensure_newline_before_comments = True