Improve type hints in qrcode (#145430)

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

homeassistant/components/qrcode/image_processing.py

@@ -21,48 +21,33 @@ def setup_platform(
     discovery_info: DiscoveryInfoType | None = None,
 ) -> None:
     """Set up the QR code image processing platform."""
+    source: list[dict[str, str]] = config[CONF_SOURCE]
     add_entities(
-        QrEntity(camera[CONF_ENTITY_ID], camera.get(CONF_NAME))
-        for camera in config[CONF_SOURCE]
+        QrEntity(camera[CONF_ENTITY_ID], camera.get(CONF_NAME)) for camera in source
     )
 
 
 class QrEntity(ImageProcessingEntity):
     """A QR image processing entity."""
 
-    def __init__(self, camera_entity, name):
+    def __init__(self, camera_entity: str, name: str | None) -> None:
         """Initialize QR image processing entity."""
         super().__init__()
 
-        self._camera = camera_entity
+        self._attr_camera_entity = camera_entity
         if name:
-            self._name = name
+            self._attr_name = name
         else:
-            self._name = f"QR {split_entity_id(camera_entity)[1]}"
-        self._state = None
+            self._attr_name = f"QR {split_entity_id(camera_entity)[1]}"
+        self._attr_state = None
 
-    @property
-    def camera_entity(self):
-        """Return camera entity id from process pictures."""
-        return self._camera
-
-    @property
-    def state(self):
-        """Return the state of the entity."""
-        return self._state
-
-    @property
-    def name(self):
-        """Return the name of the entity."""
-        return self._name
-
-    def process_image(self, image):
+    def process_image(self, image: bytes) -> None:
         """Process image."""
         stream = io.BytesIO(image)
         img = Image.open(stream)
 
         barcodes = pyzbar.decode(img)
         if barcodes:
-            self._state = barcodes[0].data.decode("utf-8")
+            self._attr_state = barcodes[0].data.decode("utf-8")
         else:
-            self._state = None
+            self._attr_state = None