関連ワード:  how to declare a dataframe in python    how to create a dataframe in python    how to define a dataframe in python    how to create a dataframe in python with column names    how to create a dataframe in python from dictionary    how to create a dataframe in python from csv    how to create a dataframe in python from list    how to create a dataframe in python with two lists    how to create a dataframe in python from excel    define dataframe in python