関連ワード:  how to get count of array in python    how to get length of array in python    how to take length of array in python    how to see length 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 get length of byte array in python    how to get number of elements in array python    how to get number of rows in array python