extremely simple lru set in python

gistfile1.txt

class LRUSet(set):
    def __init__(self, *args, max_size=None, **kws):
        self.max_size = max_size
        super().__init__(*args, **kws)

    def add(self, ent):
        if len(self) >= self.max_size:
            self.pop()
        super().discard(ent)
        super().add(ent)




def test_lruset():
    s = LRUSet([1,2,3,4,5,6], max_size=6)
    s.add(7)
    assert s == {2,3,4,5,6,7}
    s.remove(3)
    s.add(8)
    s.add(9)
    assert s == {4,5,6,7,8,9}