関連ワード:  how to create a column in python    how to create a new column in python    how to create a column vector in python    how to create a new column in python pandas    how to create a column in dataframe python    how to create a column matrix in python    how to create a new column in python dataframe    how to create a column array in python    how to create a calculated column in python    how to create a date column in python