Python数据结构之栈、队列及二叉树定义与用法浅析
本文实例讲述了Python数据结构之栈、队列及二叉树定义与用法。分享给大家供大家参考，具体如下：
目前只实现了三种，栈、队列和二叉树，哪天得空继续补吧~
1. 栈
#栈
class Stack:
def __init__(self,size = 16):
self.stack = []
self.size = size
self.top = -1
def setSize(self, size):
self.size = size
def isEmpty(self):
if self.top == -1:
return True
else:
return False
def isFull(self):
if self.top +1 == self.size:
return True
else:
return False
def top(self):
if self.isEmpty():
raise Exception("StackIsEmpty")
else:
return self.stack[self.top]
def push(self,obj):
if self.isFull():
raise Exception("StackOverFlow")
else:
self.stack.append(obj)
self.top +=1
def pop(self):
if self.isEmpty():
raise Exception("StackIsEmpty")
else:
self.top -= 1
return self.stack.pop()
def show(self):
print(self.stack)
s = Stack(5)
s.push(1)
s.push(2)
s.push(3)
s.push(4)
s.push(5)
s.show()
s.pop()
s.show()
s.push(6)
s.show()
运行结果：
2. 队列
#队列
class Queue:
def __init__(self,size = 16):
self.queue = []
self.size = size
self.front = 0
self.rear = 0
def isEmpty(self):
return self.rear == 0
def isFull(self):
if (self.front - self.rear +1) == self.size:
return True
else:
return False
def first(self):
if self.isEmpty():
raise Exception("QueueIsEmpty")
else:
return self.queue[self.front]
def last(self):
if self.isEmpty():
raise Exception("QueueIsEmpty")
else:
return self.queue[self.rear]
def add(self,obj):
if self.isFull():
raise Exception("QueueOverFlow")
else:
self.queue.append(obj)
self.rear += 1
def delete(self):
if self.isEmpty():
raise Exception("QueueIsEmpty")
else:
self.rear -=1
return self.queue.pop(0)
def show(self):
print(self.queue)
q = Queue(3)
q.add(1)
q.add(2)
q.show()
q.delete()
q.show()
运行结果：
3. 二叉树
#队列
class Queue:
def __init__(self,size = 16):
self.queue = []
self.size = size
self.front = 0
self.rear = 0
def isEmpty(self):
return self.rear == 0
def isFull(self):
if (self.front - self.rear +1) == self.size:
return True
else:
return False
def first(self):
if self.isEmpty():
raise Exception("QueueIsEmpty")
else:
return self.queue[self.front]
def last(self):
if self.isEmpty():
raise Exception("QueueIsEmpty")
else:
return self.queue[self.rear]
def add(self,obj):
if self.isFull():
raise Exception("QueueOverFlow")
else:
self.queue.append(obj)
self.rear += 1
def delete(self):
if self.isEmpty():
raise Exception("QueueIsEmpty")
else:
self.rear -=1
return self.queue.pop(0)
def show(self):
print(self.queue)
#二叉树
class BinaryTreeNode:
def __init__(self,data,left,right):
self.left = left
self.data = data
self.right = right
class BinaryTree:
def __init__(self):
self.root = None
def makeTree(self,data,left,right):
self.root = BinaryTreeNode(data,left,right)
#left.root = right.root = None
def isEmpty(self):
if self.root is None:
return True
else:
return False
def preOrder(self,r):
if r.root is not None:
print(r.root.data)
if r.root.left is not None:
self.preOrder(r.root.left)
if r.root.right is not None:
self.preOrder(r.root.right)
def inOrder(self,r):
if r.root is not None:
if r.root.left is not None:
self.inOrder(r.root.left)
print(r.root.data)
if r.root.right is not None:
self.inOrder(r.root.right)
def postOrder(self,r):
if r.root is not None:
if r.root.left is not None:
self.preOrder(r.root.left)
if r.root.right is not None:
self.preOrder(r.root.right)
print(r.root.data)
def levelOrder(self,a):
q = Queue()
r = a
while r is not None:
print(r.root.data)
if r.root.left is not None:
q.add(r.root.left)
if r.root.right is not None:
q.add(r.root.right)
if q.isEmpty():
print("empty")
r = None
else:
r = q.delete()
r = BinaryTree()
ra = BinaryTree()
ra.makeTree(2,None,None)
rb = BinaryTree()
rb.makeTree(3,None,None)
r.makeTree(1,ra,rb)
print("前序遍历")
r.preOrder(r)
print("中序遍历")
r.inOrder(r)
print("后序遍历")
r.postOrder(r)
print("层级遍历")
r.levelOrder(r)
运行结果:
后续实现了会慢慢补上~~旧的也会不断改进~~
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