diff --git a/python/pyspark/sql/udf.py b/python/pyspark/sql/udf.py
index b5a6b421fa2e9..0f759c448b8a7 100644
--- a/python/pyspark/sql/udf.py
+++ b/python/pyspark/sql/udf.py
@@ -119,7 +119,8 @@ def returnType(self):
         elif self.evalType == PythonEvalType.SQL_GROUPED_AGG_PANDAS_UDF \
                 and isinstance(self._returnType_placeholder, (StructType, ArrayType, MapType)):
             raise NotImplementedError(
-                "ArrayType, StructType and MapType are not supported with PandasUDFType.GROUPED_AGG")
+                "ArrayType, StructType and MapType are not supported with "
+                "PandasUDFType.GROUPED_AGG")
 
         return self._returnType_placeholder