[Tutor] iteritems() vs items()

[Kent Johnson]

Tim Johnson wrote:
> I need to get up to speed on iterators. I learned python 1.5~ via
> Alan G's book ...
> For an example, I've written a subclass of dict where keys are kept in
> a ordered fashion is a list called __keys:
> 
> #Here is my items function:
>     def items(self):
>     """ Return all pairs in order of addition"""
>     return [(key,self.__dict[key]) for key in self.__keys]
> 
> #And here is my iteritems function (currently does exactly the same thing)
>     def iteritems(self):
>         """ At this implementation, does exactly the same thing as 
>         method items()"""
>         for key in self.__keys:
>             yield (key,self.__dict[key])

I think you have it right. Your two methods don't do the same thing - items() returns a list of key, value pairs; iteritems() returns a generator which yields key, value pairs. This is the correct behaviour.

Kent
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