创建自己的迭代器
# -*- coding: utf-8 -*-'''创建自己的迭代器类，需要实现两个方法:1. __iter__: The iter method simply returns a reference to the object itself and is always implemented to do so.2. __next__: '''class _BagIterator: def __init__(self, theList): self._bagItems = theList self._curItem = 0 def __iter__(self): return self def __next__(self): if self._curItem < len(self._bagItems): item = self._bagItems[self._curItem] self._curItem += 1 return item else: raise StopIteration
