Python是如何实现单链表和双向链表的？
Python是如何实现单链表和双向链表的？相信很多新手小白还没学会这个技能，通过这篇文章的总结，希望你能学会。如下资料是实现单链表和双向链表的代码。
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单链表：
# -*- coding:utf-8 -*-
class Node(object):
"""节点"""
def __init__(self,elem):
self.elem = elem
self.next = None
class SingleLinkList(object):
"""单链表"""
#头结点
def __init__(self,node = None):
self._head = node
def is_empty(self):
if self._head == None:
return True
else :
return False
def length(self):
cur = self._head
count = 0
while cur != None:
cur = cur.next
count += 1
return count
def travel(self):
"""遍历整个链表"""
cur = self._head
if cur == None:
return
count = 0
while cur != None:
print(cur.elem,end=" ")
cur = cur.next
count += 1
return count
def add(self,item):
"""链表头部添加元素"""
node =Node(item)
node.next = self._head
self._head = node
def append(self,item):
"""链表尾部添加元素,叫尾插法"""
node = Node(item)
if self.is_empty():
self._head = node
else:
cur = self._head
while cur.next !=None:
cur = cur.next
cur.next = node
def insert(self,pos,item):
"""指定位置添加元素
:param pos 从0开始
"""
if pos <= 0:
self.add(item)
elif pos >= self.length():
self.append(item)
else :
pre = self._head
count = 0
while count <= pos -1:
pre = pre.next
count += 1
node = Node(item)
node.next = pre.next
pre.next = node
def remove(self,item):
"""删除指定的节点"""
cur = self._head
pre = None
while cur != None:
if cur.elem == item:
#判断是否为头结点
if cur == self._head:
self._head = cur.next
break
else :
pre.next = cur.next
break
else :
pre = cur
cur = cur.next
def search(self,item):
"""查找节点是否存在"""
cur = self._head
while cur != None:
if cur.elem == item:
return True
else :
cur = cur.next
return False
if __name__ == "__main__":
single_obj = SingleLinkList()
print(single_obj.is_empty()) #True
print(single_obj.length()) #0
single_obj.append(1)
print(single_obj.is_empty())
print(single_obj.length())
single_obj.append(2)
single_obj.add(8)
single_obj.append(3)
single_obj.append(4)
single_obj.append(5)
single_obj.append(6)
single_obj.travel() #8 1 2 3 4 5 6
print(" ")
single_obj.insert(-1,9)
single_obj.travel() #9 8 1 2 3 4 5 6
print(" ")
single_obj.insert(5,100)
single_obj.travel() #9 8 1 2 3 4 100 5 6
print(" ")
single_obj.insert(10,200)
single_obj.travel() #9 8 1 2 3 4 100 5 6 200
print(" ")
single_obj.remove(200)
single_obj.travel() # 9 8 1 2 3 4 100 5 6双向链表：
# -*- coding:utf-8 -*-
class Node(object):
"""节点"""
def __init__(self,item):
self.elem = item
self.prev = None
self.next = None
class Double_linked_list(object):
"""双链表"""
def __init__(self,node = None):
self._head = node
def is_empty(self):
if self._head is None:
return True
else:
return False
def length(self):
cur = self._head
count = 0
while cur != None:
cur = cur.next
count += 1
return count
def travel(self):
"""遍历整个链表"""
cur = self._head
if cur == None:
return
count = 0
while cur != None:
print(cur.elem,end=" ")
cur = cur.next
count += 1
return count
def add(self,item):
"""链表头部添加元素"""
node =Node(item)
node.next = self._head
self._head = node
node.next.prev = node
def append(self,item):
"""链表尾部添加元素,叫尾插法"""
node = Node(item)
if self.is_empty():
self._head = node
else:
cur = self._head
while cur.next !=None:
cur = cur.next
cur.next = node
node.prev = cur
def insert(self,pos,item):
"""指定位置添加元素
:param pos 从0开始
"""
if pos <= 0:
self.add(item)
elif pos >= self.length():
self.append(item)
else :
cur = self._head
count = 0
while count < pos :
cur = cur.next
count += 1
node = Node(item)
node.next = cur
node.prev = cur.prev
cur.prev.next = node
cur.prev = node
def remove(self,item):
"""删除指定的节点"""
cur = self._head
while cur != None:
if cur.elem == item:
#判断是否为头结点
if cur == self._head:
self._head = cur.next
if cur.next:
#判断链表是否只有一个节点
cur.next.prev = None
break
else :
cur.prev.next = cur.next
if cur.next:
cur.next.prev = cur.prev
break
else :
pre = cur
cur = cur.next
def search(self,item):
"""查找节点是否存在"""
cur = self._head
while cur != None:
if cur.elem == item:
return True
else :
cur = cur.next
return False
if __name__ == "__main__":
linkl = Double_linked_list()
print(linkl.is_empty())
print(linkl.length())
linkl.append(1)
print(linkl.is_empty())
print(linkl.length())
linkl.append(2)
linkl.add(8)
linkl.append(3)
linkl.append(4)
linkl.append(5)
linkl.append(6)
linkl.travel() #8 1 2 3 4 5 6
print(" ")
linkl.insert(-1,9)
linkl.travel() #9 8 1 2 3 4 5 6
print(" ")
linkl.insert(5,100)
linkl.travel() #9 8 1 2 3 4 100 5 6
print(" ")
linkl.insert(10,200)
linkl.travel() #9 8 1 2 3 4 100 5 6 200
print(" ")
linkl.remove(200)
linkl.travel() # 9 8 1 2 3 4 100 5 6以上就是实现单链表和双向链表的代码，详细使用情况还需要大家自己亲自动手使用过才能领会。如果想了解更多相关内容，欢迎关注创新互联行业资讯频道！
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