@@ -0,0 +1,459 @@
+#!/usr/bin/env python%0A# -*- coding:utf-8 -*-%0Afrom __future__ import division%0Afrom __future__ import unicode_literals%0Afrom __future__ import print_function%0A%0Aclass Queue(object):%0A    def __init__(self):%0A        self.items = %5B%5D%0A%0A    def isEmpty(self):%0A        return len(self.items)) == 0%0A%0A    def enqueue(self, item):%0A        self.items.insert(0, item)%0A%0A    def dequeue(self):%0A        return self.items.pop()%0A%0A    def size(self):%0A        return len(self.items)%0A

add queue implementation