関連ワード:  how to add to a 2d array in python    how to append to a 2d array in python    how to add values to a 2d array in python    how to add elements to a 2d array in python    how to add a column to a 2d array in python    how to append to a two dimensional array in python    how to create a 2d array in python    how to create a 2d array in python using numpy    how to create a 2d array in python using for loop    how to create a 2d array in python w3schools