uranusjr commented on code in PR #24018:
URL: https://github.com/apache/airflow/pull/24018#discussion_r884582494


##########
airflow/models/mappedoperator.py:
##########
@@ -201,7 +201,7 @@ def _expand(self, **mapped_kwargs: "Mappable") -> 
"MappedOperator":
         from airflow.operators.empty import EmptyOperator
 
         validate_mapping_kwargs(self.operator_class, "expand", mapped_kwargs)
-        prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="mapping 
already partial")
+        prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="unmappable 
or already specified")

Review Comment:
   The error formatting code in `prevent_duplicates` puts a colon (`:`) after 
this message, so if we want to add a period here we need to redo the formatting.
   
   This currently formats into
   
   ```
   TypeError: unmappable or already specified argument: params
   ```
   
   and a dot would be out of place.



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