Armin Rigo added the comment: Well, adding weak references left and right to break cycles is going to subtly change or break people's code and hasn't been done so far, but that's only my opinion. Anyway, I want to correct what you say about tp_subclasses: yes, tp_subclasses is a list of weakrefs, but the reason is not (as I think you mean) to avoid cycles. The reason is simply that if it were strong references, then all classes ever created would stay alive.
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