robert.schuppenies at gmail
Aug 25, 2008, 1:32 AM
Views: 729
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no tp_traverse for dict iters
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Hi.
Could you please explain to me why some iterators have a tp_traverse
implementation and others do not? For example tupleiterator has one,
but none of the dict iterators. Same for set iterators (and possibly
others). It shows in Python when you use the get_referents function.
>>> t = (1,2,3)
>>> gc.get_referents(iter(t))
[(1, 2, 3)]
>>> s = set([1,2,3])
>>> gc.get_referents(iter(s))
[]
>>> d = {1:1, 2:2}
>>> gc.get_referents(iter(d))
[]
And is it correct that you can rephrase the question to 'why some
iterators are seen as container objects and others are not'?
thanks,
robert
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no tp_traverse for dict iters
