attempt to fix types

brother_ql_web/utils.py

@@ -1,12 +1,19 @@
 from __future__ import annotations
 
+import sys
 from typing import cast
 
 from brother_ql.backends import backend_factory, BrotherQLBackendGeneric, guess_backend
 from brother_ql.devicedependent import label_type_specs, label_sizes
 from brother_ql_web.configuration import Configuration
 from brother_ql_web.font_helpers import get_fonts
 
+if sys.version_info < (3, 9):
+ from typing import Type
+ BACKEND_TYPE = Type[BrotherQLBackendGeneric]
+else:
+ BACKEND_TYPE = type[BrotherQLBackendGeneric]
+
 
 def collect_fonts(configuration: Configuration) -> dict[str, dict[str, str]]:
  fonts = get_fonts()
@@ -23,14 +30,14 @@ class BackendGuessingError(ValueError):
  pass
 
 
-def get_backend_class(configuration: Configuration) -> type[BrotherQLBackendGeneric]:
+def get_backend_class(configuration: Configuration) -> BACKEND_TYPE:
  try:
  selected_backend = guess_backend(configuration.printer.printer)
  except ValueError:
  raise BackendGuessingError(
  "Couln't guess the backend to use from the printer string descriptor"
  )
  return cast(
- type[BrotherQLBackendGeneric],
+ BACKEND_TYPE,
  backend_factory(selected_backend)["backend_class"],
  )

brother_ql_web/web.py

@@ -5,7 +5,6 @@
 from typing import Any, cast
 
 import bottle
-from brother_ql.backends import BrotherQLBackendGeneric
 from brother_ql_web.configuration import Configuration
 from brother_ql_web.labels import (
  LabelParameters,
@@ -14,6 +13,7 @@
  generate_label,
  print_label,
 )
+from brother_ql_web.utils import BACKEND_TYPE
 
 
 logger = logging.getLogger(__name__)
@@ -133,7 +133,7 @@ def print_text() -> dict[str, bool | str]:
  Configuration, get_config("brother_ql_web.configuration")
  ),
  backend_class=cast(
- type[BrotherQLBackendGeneric],
+ BACKEND_TYPE,
  get_config("brother_ql_web.backend_class"),
  ),
  )
@@ -152,7 +152,7 @@ def main(
  configuration: Configuration,
  fonts: dict[str, dict[str, str]],
  label_sizes: list[tuple[str, str]],
- backend_class: type[BrotherQLBackendGeneric],
+ backend_class: BACKEND_TYPE,
 ) -> None:
  app = bottle.default_app()
  app.config["brother_ql_web.configuration"] = configuration

tests/test_cli.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from argparse import Namespace
 from io import StringIO
 from contextlib import redirect_stderr

tests/test_configuration.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 from tempfile import NamedTemporaryFile
 from typing import cast

tests/test_font_helpers.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from unittest import TestCase
 
 from brother_ql_web.font_helpers import get_fonts