[property] Add DType Failure Information

For append and extend methods, inferred and expected dtype are listed.

Author: fschrader1992

odml/property.py

@@ -590,8 +590,8 @@ def extend(self, obj, strict=True):
         if len(new_value) > 0 and strict and dtypes.infer_dtype(new_value[0]) != self.dtype:
 
             if not (dtypes.infer_dtype(new_value[0]) == "string" and self.dtype in dtypes.special_dtypes):
-                raise ValueError("odml.Property.extend: "
-                                 "passed value data type does not match dtype!")
+                raise ValueError("odml.Property.extend: passed value data type found (\"%s\") "
+                                 "does not match expected dtype \"%s\"!" % (dtypes.infer_dtype(new_value[0]), self._dtype))
 
         if not self._validate_values(new_value):
             raise ValueError("odml.Property.extend: passed value(s) cannot be converted "
@@ -622,8 +622,8 @@ def append(self, obj, strict=True):
         if len(new_value) > 0 and strict and dtypes.infer_dtype(new_value[0]) != self.dtype:
 
             if not (dtypes.infer_dtype(new_value[0]) == "string" and self.dtype in dtypes.special_dtypes):
-                raise ValueError("odml.Property.append: "
-                                 "passed value data type does not match dtype!")
+                raise ValueError("odml.Property.append: passed value data type found (\"%s\") "
+                                 "does not match expected dtype \"%s\"!" % (dtypes.infer_dtype(new_value[0]), self._dtype))
 
         if not self._validate_values(new_value):
             raise ValueError("odml.Property.append: passed value(s) cannot be converted "