define constants for reused errors

Author: ArnoutD

plugwise_usb/__init__.py

@@ -10,7 +10,7 @@
 from collections.abc import Callable, Coroutine
 from functools import wraps
 import logging
-from typing import Any, TypeVar, cast
+from typing import Any, TypeVar, cast, Final
 
 from .api import NodeEvent, PlugwiseNode, StickEvent
 from .connection import StickController
@@ -19,7 +19,7 @@
 
 FuncT = TypeVar("FuncT", bound=Callable[..., Any])
 
-
+NOT_INITIALIZED_STICK_ERROR: Final[StickError] = StickError("Cannot load nodes when network is not initialized")
 _LOGGER = logging.getLogger(__name__)
 
 
@@ -319,9 +319,7 @@ async def start_network(self) -> None:
     async def load_nodes(self) -> bool:
         """Load all discovered nodes."""
         if self._network is None:
-            raise StickError(
-                "Cannot load nodes when network is not initialized"
-            )
+            raise NOT_INITIALIZED_STICK_ERROR
         if not self._network.is_running:
             raise StickError(
                 "Cannot load nodes when network is not started"
@@ -333,19 +331,15 @@ async def load_nodes(self) -> bool:
     async def discover_coordinator(self, load: bool = False) -> None:
         """Discover the network coordinator."""
         if self._network is None:
-            raise StickError(
-                "Cannot load nodes when network is not initialized"
-            )
+            raise NOT_INITIALIZED_STICK_ERROR
         await self._network.discover_network_coordinator(load=load)
 
     @raise_not_connected
     @raise_not_initialized
     async def discover_nodes(self, load: bool = False) -> None:
         """Discover all nodes."""
         if self._network is None:
-            raise StickError(
-                "Cannot load nodes when network is not initialized"
-            )
+            raise NOT_INITIALIZED_STICK_ERROR
         await self._network.discover_nodes(load=load)
 
     @raise_not_connected

plugwise_usb/messages/properties.py

@@ -3,12 +3,13 @@
 import binascii
 from datetime import UTC, date, datetime, time, timedelta
 import struct
-from typing import Any
+from typing import Any, Final
 
 from ..constants import LOGADDR_OFFSET, PLUGWISE_EPOCH, UTF8
 from ..exceptions import MessageError
 from ..helpers.util import int_to_uint
 
+DESERIALIZE_ERROR: Final[MessageError] = MessageError("Unable to return value. Deserialize data first")
 
 class BaseType:
     """Generic single instance property."""
@@ -72,7 +73,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> bytes:
         """Return bytes value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -92,7 +93,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> str:
         """Return converted int value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -121,7 +122,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> int:
         """Return converted int value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -155,7 +156,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> int:
         """Return converted datetime value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -183,7 +184,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> datetime:
         """Return converted datetime value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -203,7 +204,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> int:
         """Return converted int value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -240,14 +241,14 @@ def deserialize(self, val: bytes) -> None:
     def value_set(self) -> bool:
         """True when datetime is converted."""
         if not self._deserialized:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value is not None
 
     @property
     def value(self) -> datetime:
         """Return converted datetime value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -272,7 +273,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> time:
         """Return converted time value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -297,7 +298,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> str:
         """Return converted string value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -326,7 +327,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> time:
         """Return converted time value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -355,7 +356,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> date:
         """Return converted date value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -376,7 +377,7 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> float:
         """Return converted float value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value
 
 
@@ -399,5 +400,5 @@ def deserialize(self, val: bytes) -> None:
     def value(self) -> int:
         """Return converted time value."""
         if self._value is None:
-            raise MessageError("Unable to return value. Deserialize data first")
+            raise DESERIALIZE_ERROR
         return self._value