Check to see if attr exists (#464)

Author: njooma

examples/server/v1/components.py

@@ -338,7 +338,7 @@ async def model_attributes(self) -> Board.Attributes:
     async def set_power_mode(self, **kwargs):
         raise NotImplementedError()
 
-    async def write_analog(self, pin: str, value: int, *, timeout: float | None = None, **kwargs):
+    async def write_analog(self, pin: str, value: int, *, timeout: Optional[float] = None, **kwargs):
         raise NotImplementedError()
 
     async def get_geometries(self, extra: Optional[Dict[str, Any]] = None, **kwargs) -> List[Geometry]:

src/viam/media/viam_rgba_plugin.py

@@ -55,7 +55,10 @@ def _open(self):
         width = int.from_bytes(header[4:8], "big")
         height = int.from_bytes(header[8:12], "big")
         self._size = width, height
-        self._mode = "RGBA"
+        if hasattr(self, "_mode"):
+            self._mode = "RGBA"
+        else:
+            self.mode = "RGBA"
 
         # data descriptor
         self.tile = [(RGBAEncoder.ENCODER_NAME, (0, 0, width, height), RGBA_HEADER_LENGTH, (self.mode, 0, 1))]