Python 使用单链表实现队列 (基于class, 包含迭代器)

#!/usr/bin/python 
# -*- coding: utf-8 -*-

'''
Created on 2015-2-3
@author: beyondzhou
@name: test_linklistqueue.py
'''

def test_linklistqueue():
    
    # import pyListQueue
    from myqueue import linkListQueue
    
    print '#Init a queue named smith using enqueue'
    smith = linkListQueue()
    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 
        
    smith.enqueue('ECON-102')  
    print '\n#output smith after enqueue again'
    for element in smith:
        print element 
        
    print '\n#get the length of queue'
    print 'the lenght of queue is ', len(smith)
    
    print '\n#check wheter the queue is empty'
    if smith.