python--range()

>>> range(1,10) [1, 2, 3, 4, 5, 6, 7, 8, 9] >>> range(1,10,2) [1, 3, 5, 7, 9] >>> range(10,1,-1) [10, 9, 8, 7, 6, 5, 4, 3, 2] >>> range(1,10,-1) [] >>> range(10,1,-3) [10, 7, 4] >>>

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