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#-*-coding:utf-8-*-

class Stack(object):

'''栈'''

def __init__(self):

self.items = []

def is_empty(self):

'''判断栈是否为空'''

return self.items==[]

def push(self,item):

'''进栈操作'''

self.items.append(item)

def pop(self):

'''出栈操作'''

return self.items.pop()

def peek(self):

'''返回栈顶元素'''

return self.items[len(self.items)-1]

def size(self):

'''返回栈的大小'''

return len(self.items)

if __name__ == '__main__':

stack = Stack()

stack.push("hello")

stack.push("world")

print stack.size()

print stack.peek()

print stack.pop()

print stack.pop()