Python | Leetcode Python题解之第284题窥视迭代器
题目：
题解：
class PeekingIterator:def __init__(self, iterator):self.iterator = iteratorself._next = iterator.next()self._hasNext = iterator.hasNext()def peek(self):return self._nextdef next(self):ret = self._nextself._hasNext = self.iterator.hasNext()self._next = self.iterator.next() if self._hasNext else 0return retdef hasNext(self):return self._hasNext