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10_iterator.py
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10_iterator.py
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# coding : utf-8
# create by ztypl on 2017/5/27
class LinkList:
"""链表 头结点保存链表的长度"""
class Node:
def __init__(self, item=None):
self.item = item
self.next = None
class LinkListIterator:
def __init__(self, node):
self.node = node
def __next__(self):
if self.node:
cur_node = self.node
self.node = cur_node.next
return cur_node.item
else:
raise StopIteration
def __iter__(self):
return self
def __init__(self, iterable=None):
self.head = LinkList.Node(0)
self.tail = self.head
self.extend(iterable)
def append(self, obj):
s = LinkList.Node(obj)
self.tail.next = s
self.tail = s
def extend(self, iterable):
for obj in iterable:
self.append(obj)
self.head.item += len(iterable)
def __iter__(self):
return self.LinkListIterator(self.head.next)
def __len__(self):
return self.head.item
def __str__(self):
return "<<"+", ".join(map(str, self))+">>"
li = [i for i in range(100)]
print(li)
lk = LinkList(li)
# for i in lk:
# print(i)
print(lk)
# print(len(lk))