python list 基礎

>>> L = range(10)
>>> L[::2]
[0, 2, 4, 6, 8]
>>> L[:]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> L[::]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> L[::3]
[0, 3, 6, 9]