Python がスタックとキューを実装する方法の詳細な例

class Stack():  
    def init(self,size):  
        self.size=size;  
        self.stack=[];  
        self.top=-1;  
    def push(self,ele):  #入栈之前检查栈是否已满  
        if self.isfull():  
            raise exception("out of range");  
        else:  
            self.stack.append(ele);  
            self.top=self.top+1;  
    def pop(self):             # 出栈之前检查栈是否为空  
        if self.isempty():  
            raise exception("stack is empty");  
        else:  
            self.top=self.top-1;  
            return self.stack.pop();  
      
    def isfull(self):  
        return self.top+1==self.size;  
    def isempty(self):  
        return self.top==-1;

#!/usr/bin/python   
from stack import Stack  
s=Stack(20);  
for i in range(3):  
    s.push(i);  
s.pop()  
print
 s.isempty();

class Queue():  
    def init(self,size):  
        self.size=size;  
        self.front=-1;  
        self.rear=-1;  
        self.queue=[];  
    def enqueue(self,ele):  #入队操作  
        if self.isfull():  
            raise exception("queue is full");  
        else:  
            self.queue.append(ele);  
            self.rear=self.rear+1;  
    def dequeue(self):      #出队操作  
        if self.isempty():  
            raise exception("queue is empty");  
        else:  
            self.front=self.front+1;  
            return self.queue[self.front];  
    def isfull(self):  
        return self.rear-self.front+1==self.size;  
    def isempty(self):  
        return self.front==self.rear;  
      
q=Queue(10);  
for i in range(3):  
    q.enqueue(i);  
print q.dequeue();  
print q.isempty();