Improve type hint in cups sensor entity (#77030)

homeassistant/components/cups/sensor.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 from datetime import timedelta
 import importlib
 import logging
+from typing import Any
 
 import voluptuous as vol
 
@@ -62,10 +63,10 @@ def setup_platform(
     discovery_info: DiscoveryInfoType | None = None,
 ) -> None:
     """Set up the CUPS sensor."""
-    host = config[CONF_HOST]
-    port = config[CONF_PORT]
-    printers = config[CONF_PRINTERS]
-    is_cups = config[CONF_IS_CUPS_SERVER]
+    host: str = config[CONF_HOST]
+    port: int = config[CONF_PORT]
+    printers: list[str] = config[CONF_PRINTERS]
+    is_cups: bool = config[CONF_IS_CUPS_SERVER]
 
     if is_cups:
         data = CupsData(host, port, None)
@@ -73,6 +74,7 @@ def setup_platform(
         if data.available is False:
             _LOGGER.error("Unable to connect to CUPS server: %s:%s", host, port)
             raise PlatformNotReady()
+        assert data.printers is not None
 
         dev: list[SensorEntity] = []
         for printer in printers:
@@ -108,17 +110,14 @@ def setup_platform(
 class CupsSensor(SensorEntity):
     """Representation of a CUPS sensor."""
 
-    def __init__(self, data, printer):
+    _attr_icon = ICON_PRINTER
+
+    def __init__(self, data: CupsData, printer_name: str) -> None:
         """Initialize the CUPS sensor."""
         self.data = data
-        self._name = printer
-        self._printer = None
-        self._available = False
-
-    @property
-    def name(self):
-        """Return the name of the sensor."""
-        return self._name
+        self._attr_name = printer_name
+        self._printer: dict[str, Any] | None = None
+        self._attr_available = False
 
     @property
     def native_value(self):
@@ -129,16 +128,6 @@ class CupsSensor(SensorEntity):
         key = self._printer["printer-state"]
         return PRINTER_STATES.get(key, key)
 
-    @property
-    def available(self):
-        """Return True if entity is available."""
-        return self._available
-
-    @property
-    def icon(self):
-        """Return the icon to use in the frontend, if any."""
-        return ICON_PRINTER
-
     @property
     def extra_state_attributes(self):
         """Return the state attributes of the sensor."""
@@ -160,8 +149,10 @@ class CupsSensor(SensorEntity):
     def update(self) -> None:
         """Get the latest data and updates the states."""
         self.data.update()
-        self._printer = self.data.printers.get(self._name)
-        self._available = self.data.available
+        assert self.name is not None
+        assert self.data.printers is not None
+        self._printer = self.data.printers.get(self.name)
+        self._attr_available = self.data.available
 
 
 class IPPSensor(SensorEntity):
@@ -170,28 +161,20 @@ class IPPSensor(SensorEntity):
     This sensor represents the status of the printer.
     """
 
-    def __init__(self, data, name):
+    _attr_icon = ICON_PRINTER
+
+    def __init__(self, data: CupsData, printer_name: str) -> None:
         """Initialize the sensor."""
         self.data = data
-        self._name = name
+        self._printer_name = printer_name
         self._attributes = None
-        self._available = False
+        self._attr_available = False
 
     @property
     def name(self):
         """Return the name of the sensor."""
         return self._attributes["printer-make-and-model"]
 
-    @property
-    def icon(self):
-        """Return the icon to use in the frontend."""
-        return ICON_PRINTER
-
-    @property
-    def available(self):
-        """Return True if entity is available."""
-        return self._available
-
     @property
     def native_value(self):
         """Return the state of the sensor."""
@@ -237,8 +220,8 @@ class IPPSensor(SensorEntity):
     def update(self) -> None:
         """Fetch new state data for the sensor."""
         self.data.update()
-        self._attributes = self.data.attributes.get(self._name)
-        self._available = self.data.available
+        self._attributes = self.data.attributes.get(self._printer_name)
+        self._attr_available = self.data.available
 
 
 class MarkerSensor(SensorEntity):
@@ -247,24 +230,17 @@ class MarkerSensor(SensorEntity):
     This sensor represents the percentage of ink or toner.
     """
 
-    def __init__(self, data, printer, name, is_cups):
+    _attr_icon = ICON_MARKER
+    _attr_native_unit_of_measurement = PERCENTAGE
+
+    def __init__(self, data: CupsData, printer: str, name: str, is_cups: bool) -> None:
         """Initialize the sensor."""
         self.data = data
-        self._name = name
+        self._attr_name = name
         self._printer = printer
         self._index = data.attributes[printer]["marker-names"].index(name)
         self._is_cups = is_cups
-        self._attributes = None
-
-    @property
-    def name(self):
-        """Return the name of the sensor."""
-        return self._name
-
-    @property
-    def icon(self):
-        """Return the icon to use in the frontend."""
-        return ICON_MARKER
+        self._attributes: dict[str, Any] | None = None
 
     @property
     def native_value(self):
@@ -274,11 +250,6 @@ class MarkerSensor(SensorEntity):
 
         return self._attributes[self._printer]["marker-levels"][self._index]
 
-    @property
-    def native_unit_of_measurement(self):
-        """Return the unit of measurement."""
-        return PERCENTAGE
-
     @property
     def extra_state_attributes(self):
         """Return the state attributes of the sensor."""
@@ -318,17 +289,17 @@ class MarkerSensor(SensorEntity):
 class CupsData:
     """Get the latest data from CUPS and update the state."""
 
-    def __init__(self, host, port, ipp_printers):
+    def __init__(self, host: str, port: int, ipp_printers: list[str] | None) -> None:
         """Initialize the data object."""
         self._host = host
         self._port = port
         self._ipp_printers = ipp_printers
         self.is_cups = ipp_printers is None
-        self.printers = None
-        self.attributes = {}
+        self.printers: dict[str, dict[str, Any]] | None = None
+        self.attributes: dict[str, Any] = {}
         self.available = False
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest data from CUPS."""
         cups = importlib.import_module("cups")
 
@@ -336,9 +307,11 @@ class CupsData:
             conn = cups.Connection(host=self._host, port=self._port)
             if self.is_cups:
                 self.printers = conn.getPrinters()
+                assert self.printers is not None
                 for printer in self.printers:
                     self.attributes[printer] = conn.getPrinterAttributes(name=printer)
             else:
+                assert self._ipp_printers is not None
                 for ipp_printer in self._ipp_printers:
                     self.attributes[ipp_printer] = conn.getPrinterAttributes(
                         uri=f"ipp://{self._host}:{self._port}/{ipp_printer}"