関連ワード:  how to clear a dataframe in python    how to delete a dataframe in python    how to empty a dataframe in python    how to reset a dataframe in python    how to clear a dataframe in pandas    how to delete a dataframe column in python    how to delete a dataframe in pandas    how to empty a dataframe in pandas    how to remove rows from a dataframe in python    how to create a empty dataframe in python