関連ワード:  how to declare a 2 d array in python    how to create a 2 d array in python    how to define a 2 dimensional array in python    how to initialize a 2 dimensional array in python    how to create 2 dimensional array in python using numpy    how to declare an empty 2 dimensional array in python    how to create an empty 2 dimensional array in python    how to declare a multidimensional array in python    how to initialize a 2d array in python    how to declare a 2d matrix in python