range([start], stop[, step])：产生一个序列，默认从0开始

range([start], stop[, step])：产生一个序列，默认从0开始

>>> l = range(10)
>>> l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> L = range(3,10)
>>> L
[3, 4, 5, 6, 7, 8, 9]
>>> LL = range(1,23, 2)
>>> LL
[1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21]
>>>