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 = rightclass 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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