Python Implementation queue using List (class-based, iterator included)

#!/usr/bin/python #-*-Coding:utf-8-*-"Created on 2015-1-27@author:beyondzhou@name:test_listqueue.py" Def Test_ Listqueue (): # import Pylistqueue from myqueue import pylistqueue print ' #Init a queue named Smith using    Enqueue ' Smith = Pylistqueue () smith.enqueue (' CSCI-112 ') smith.enqueue (' MATH-121 ') smith.enqueue (' HIST-340 ')               Smith.enqueue (' ECON-101 ') print ' \n#output Smith queue ' for element in Smith:print element        print ' \n#dequeue one item ' Smith.dequeue () print ' \n#output Smith after Dequeue ' for element in Smith: Print element print ' \n#get the length of the queue ' print ' The lenght of the queue is ', Len (Smith) PR    int ' \n#check wheter the queue is empty ' if Smith.isempty (): print ' queue is empty! '            Else:print ' queue is not empty! ' print ' \n#dequeue all items ' and not Smith.isempty (): Smith.dequeue () print ' \n#check wheter the queue is empty after dequeue all items ' if Smith.isempty (): print ' queue is empty! '    Else:print ' queue is not empty! ' if __name__ = = "__main__": Test_listqueue ()

# Implementation of Iterclass _pylistqueueiterator:def __init__ (self, thelist): Self._setitems = theList Self._curitem = 0 def __iter__ (self): return self def next (self): if Self._curitem < Len (self._set            Items): item = Self._setitems[self._curitem] Self._curitem + = 1 return item Else:  Raise Stopiteration # Implementation of the Queue ADT using a Python listclass pylistqueue: # creates An empty queue def __init__ (self): Self._qlist = List () # Returns True If the queue is empty def isEmpty ( Self): return len = = 0 # Returns The number of items in the queue def __len__ (self): return Len ( self._qlist) # Adds The given item to the queue Def enqueue (self, item): Self._qlist.append (item) # Remove S and returns the first item in the Queue Def dequeue (self): Assert not Self.isempty (), "Cannot dequeue from an        Empty queue. " RetUrn Self._qlist.pop (0) # Returns an iterator for traversing the list of items Def __iter__ (self): return _pyl Istqueueiterator (Self._qlist)

#Init a queue named Smith using Enqueue#output Smith queuecsci-112math-121hist-340econ-101#dequeue one item#output Smith a fter dequeuemath-121hist-340econ-101#get The length of queuethe lenght of the queue is  3#check wheter the queue is Emptyqu Eue isn't empty! #dequeue all Items#check wheter the queue was empty after dequeue all Itemsqueue is empty!

Python Implementation queue using List (class-based, iterator included)