First version of DefaultDataFilter

src/core/Expando.py

@@ -50,6 +50,9 @@ class Expando:
   def to_dict(self, mappings: dict) -> dict:
     return {prop_name: self.get(path) for path, prop_name in mappings.items() if prop_name is not None}
   
+  def __hasattr__(self, item):
+    return item in self._props
+  
   def __repr__(self):
     if "key" in self._props:
       return f"Expando(key={self._props["key"]})"