関連ワード:  python create new column dataframe    python insert new column in dataframe    python dataframe create new column based on condition    python dataframe create new column from existing    python dataframe create new column based on multiple condition    python dataframe create new column based on function    python insert a column in dataframe    python dataframe create new column with default value    python dataframe create new column based on if condition    python create new empty column in dataframe