fix pyStyle3

Author: brkyvz

python/pyspark/sql/__init__.py

@@ -53,7 +53,8 @@
 
 from pyspark.sql.types import Row
 from pyspark.sql.context import SQLContext, HiveContext
-from pyspark.sql.dataframe import DataFrame, GroupedData, Column, SchemaRDD, DataFrameNaFunctions, DataFrameStatFunctions
+from pyspark.sql.dataframe import DataFrame, GroupedData, Column, SchemaRDD, DataFrameNaFunctions
+from pyspark.sql.dataframe import DataFrameStatFunctions
 
 __all__ = [
     'SQLContext', 'HiveContext', 'DataFrame', 'GroupedData', 'Column', 'Row',