関連ワード:  pandas apply same function to multiple columns    pandas groupby apply same function to multiple columns    pandas apply function to multiple columns    pandas apply function to multiple columns at once    pandas apply lambda function to multiple columns    pandas apply string function to multiple columns    pandas apply custom function to multiple columns    pandas apply function to two columns    pandas apply function to all columns    dataframe apply function to multiple columns  
結果 : pandas apply same function to multiple columns