関連ワード:  how to get part of an array python    how to take part of an array python    how to extract part of an array in python    how to get length of an array python    how to get size of an array python    how to get index of an array python    how to get sum of an array python    how to get average of an array python    how to get max of an array python    how to get all subarrays of an array python