Use check_valid_float helper in significant change support of sensor and weather (#106013)

homeassistant/components/sensor/significant_change.py

@@ -12,6 +12,7 @@ from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.significant_change import (
     check_absolute_change,
     check_percentage_change,
+    check_valid_float,
 )
 
 from . import SensorDeviceClass
@@ -63,23 +64,20 @@ def async_check_significant_change(
         absolute_change = 1.0
         percentage_change = 2.0
 
-    try:
+    if not check_valid_float(new_state):
         # New state is invalid, don't report it
-        new_state_f = float(new_state)
-    except ValueError:
         return False
 
-    try:
+    if not check_valid_float(old_state):
         # Old state was invalid, we should report again
-        old_state_f = float(old_state)
-    except ValueError:
         return True
 
     if absolute_change is not None and percentage_change is not None:
         return _absolute_and_relative_change(
-            old_state_f, new_state_f, absolute_change, percentage_change
+            float(old_state), float(new_state), absolute_change, percentage_change
         )
     if absolute_change is not None:
-        return check_absolute_change(old_state_f, new_state_f, absolute_change)
-
+        return check_absolute_change(
+            float(old_state), float(new_state), absolute_change
+        )
     return None

homeassistant/components/weather/significant_change.py

@@ -5,7 +5,10 @@ from typing import Any
 
 from homeassistant.const import UnitOfPressure, UnitOfSpeed, UnitOfTemperature
 from homeassistant.core import HomeAssistant, callback
-from homeassistant.helpers.significant_change import check_absolute_change
+from homeassistant.helpers.significant_change import (
+    check_absolute_change,
+    check_valid_float,
+)
 
 from .const import (
     ATTR_WEATHER_APPARENT_TEMPERATURE,
@@ -60,15 +63,6 @@ VALID_CARDINAL_DIRECTIONS: list[str] = [
 ]
 
 
-def _check_valid_float(value: str | int | float) -> bool:
-    """Check if given value is a valid float."""
-    try:
-        float(value)
-    except ValueError:
-        return False
-    return True
-
-
 def _cardinal_to_degrees(value: str | int | float | None) -> int | float | None:
     """Translate a cardinal direction into azimuth angle (degrees)."""
     if not isinstance(value, str):
@@ -109,11 +103,11 @@ def async_check_significant_change(
             old_attr_value = _cardinal_to_degrees(old_attr_value)
             new_attr_value = _cardinal_to_degrees(new_attr_value)
 
-        if new_attr_value is None or not _check_valid_float(new_attr_value):
+        if new_attr_value is None or not check_valid_float(new_attr_value):
             # New attribute value is invalid, ignore it
             continue
 
-        if old_attr_value is None or not _check_valid_float(old_attr_value):
+        if old_attr_value is None or not check_valid_float(old_attr_value):
             # Old attribute value was invalid, we should report again
             return True