Serhiy Storchaka added the comment:

This can be a common case in following algorithm (mesh optimization):

while elems:
    elem = elems.pop()
    changed = optimize(elem)
    if changed:
        elems.update(neighbors(elem))

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23259>
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