関連ワード:  how to get column in array python    how to get column in matrix python    how to get columns in 2d array python    how to get number of columns in array python    how to select a column in array python    how to get number of columns in matrix python    how to get column length of 2d array in python    how to get number of columns in 2d array python    how to get first column of array python    how to add column in array python