関連ワード:  how to set length of array in python    how to set size of array in python    how to define length of array in python    how to define size of array in python    how to specify size of array in python    how to change size of array in python    how to change the length of an array in python    how to specify the length of an array in python    how to create variable length array in python    how to create a fixed length array in python