On Sunday 20 March 2005 20:47, George Sakkis wrote: > Not always. Say for example that you're doing some 2D geometry stuff, and > later you have to extend it to 3D. In this case you may have to deal with > both 2D and 3D objects, and map the former to the latter when necessary.
But this rather sounds like you'd want an adaptor iterator, like the following: >>> class AdaptPossible2D(object): ... def __init__(self,data): ... self.data = data ... def __iter__(self): ... for item in self.data: ... if len(item) == 2: ... yield item+(0,) ... else: ... yield item ... >>> for x,y,z in AdaptPossible2D([(1,2),(1,2,3),(3,4)]): ... print x,y,z ... 1 2 0 1 2 3 3 4 0 Using the above code makes it absolutely clear what you want, and doesn't need any new syntax which can be ambiguous like (x=0,y,z=0), etc. The above idiom also takes only constant extra space, as it doesn't duplicate the list during iteration. -- --- Heiko.
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