Performance boost by particle.__setattr__ to call numpy data directly

Author: erikvansebille

parcels/particle.py

@@ -121,7 +121,7 @@ def __setattr__(self, name, value):
         if name in ["_data", "_index"]:
             object.__setattr__(self, name, value)
         else:
-            self._data[name][self._index] = value
+            self._data[name].data[self._index] = value
 
     def delete(self):
         """Signal the particle for deletion."""