Python-dict.items（）和dict.iteritems（）有什么区别？

Dict.items()和之间有适用的区别Dict.iteritems()吗？@H_874_3@

从Python文档中：@H_874_3@

Dict.items()：返回字典的（键，值）对列表的副本。@H_874_3@

Dict.iteritems()：在字典的（键，值）对上返回迭代器。@H_874_3@

如果我运行下面的代码，每个似乎都返回对同一对象的引用。我缺少任何细微的差异吗？@H_874_3@

#!/usr/bin/python

d={1:'one',2:'two',3:'three'}
print 'd.items():'
for k,v in d.items():
   if D[k] is v: print '\tthey are the same object' 
   else: print '\tthey are different'

print 'd.iteritems():'   
for k,v in d.iteritems():
   if D[k] is v: print '\tthey are the same object' 
   else: print '\tthey are different'   

输出：@H_874_3@

d.items():
    they are the same object
    they are the same object
    they are the same object
d.iteritems():
    they are the same object
    they are the same object
    they are the same object