関連ワード:  python add value to dataframe column    python append value to dataframe column    python pandas dataframe add value to column    python pandas add value to column    python add column with same value to dataframe    python add column with constant value to dataframe    python add column to dataframe with default value    python add new column to dataframe with value    python add column to dataframe and set value    python add new column to dataframe with default value