python-2.7 - 循环选择列表元素

Question

我有一个像下面的 list

list1 = [cont1，cont2，cont4，cont5]

如何在python中实现循环逻辑以选择列表中的元素，
每次我尝试访问元素

Answer 1

我建议使用 itertools.cycle 。

Make an iterator returning elements from the iterable and saving a copy of each. When the iterable is exhausted, return elements from the saved copy. Repeats indefinitely.

用法示例:

seq = [1,2,3,4]
round_robin = itertools.cycle(seq)

assert round_robin.next() == 1
assert round_robin.next() == 2
assert round_robin.next() == 3
assert round_robin.next() == 4
assert round_robin.next() == 1
assert round_robin.next() == 2
assert round_robin.next() == 3
assert round_robin.next() == 4