【Python】使用多个迭代器

如果要达到多个迭代器的效果，__iter__()只需替迭代器定义新的状态对象，而不是返回self

 1 class SkipIterator:
 2     def __init__(self, wrapped):
 3         self.wrapped = wrapped
 4         self.offset = 0
 5 
 6     def __next__(self):
 7         if self.offset >= len(self.wrapped):
 8             raise StopIteration
 9         else:
10             item = self.wrapped[self.offset]
11             self.offset+=2
12             return item
13 
14 
15 class SkipObject:
16     def __init__(self, wrapped):
17         self.wrapped = wrapped
18 
19     def __iter__(self):
20         return SkipIterator(self.wrapped)
21 
22 
23 if __name__ == '__main__':
24     hhh = 'hahaha'
25     skipper = SkipObject(hhh)
26     for i in skipper:
27         print(i)
28 
29     I = iter(skipper)
30     print(next(I), next(I), next(I))

 参考资料：Python学习手册

posted @ 2016-12-31 22:05  wilderness  阅读(639)  评论(0)  编辑  收藏  举报