Typing relaxed to allow a return value of "None".

mirobo/fan.py

@@ -1,6 +1,6 @@
 import logging
 from .device import Device
-from typing import Any, Dict
+from typing import Any, Dict, Optional
 import enum
 
 _LOGGER = logging.getLogger(__name__)
@@ -42,22 +42,20 @@ def humidity(self) -> int:
         return self.data["humidity"]
 
     @property
-    def temperature(self) -> float:
+    def temperature(self) -> Optional[float]:
         if self.data["temp_dec"] is not None:
             return self.data["temp_dec"] / 10.0
-        else:
-            return None
+        return None
 
     @property
     def led(self) -> bool:
         return self.data["led"] == "on"
 
     @property
-    def led_brightness(self) -> LedBrightness:
+    def led_brightness(self) -> Optional[LedBrightness]:
         if self.data["led_b"] is not None:
             return LedBrightness(self.data["led_b"])
-        else:
-            return None
+        return None
 
     @property
     def buzzer(self) -> bool: