関連ワード:  how to get len of array in python    how to get length of array in python    how to get size of array in python    how to get count of array in python    how to get length of numpy array in python    how to get length of json array in python    how to get length of 2d array in python    how to calculate size of array in python    how to get size of 2d array in python    how to get size of numpy array in python