increase verbosity

increase verbosity of error message by including the type causing the error in the error message

Author: romeokienzler

pandas/core/strings/accessor.py

@@ -252,7 +252,7 @@ def _validate(data):
         inferred_dtype = lib.infer_dtype(values, skipna=True)
 
         if inferred_dtype not in allowed_types:
-            raise AttributeError("Can only use .str accessor with string values!")
+            raise AttributeError(f"Can only use .str accessor with string values! Inferred dType: {inferred_dtype}")
         return inferred_dtype
 
     def __getitem__(self, key):