関連ワード:  pandas create empty dataframe    pandas create empty dataframe with column names    pandas create empty dataframe with column names and types    pandas create empty dataframe with columns    pandas create empty dataframe and append rows    pandas create empty dataframe with schema    pandas create empty dataframe with column names and dtypes    pandas create empty dataframe with index    pandas create empty dataframe with column names from other dataframe    pandas create empty dataframe with only column names