Method pop

recipes/Python/577624_OrderedSet/recipe-577624.py:46–51

(self, last=True)

            curr = curr[self.PREV]

    def pop(self, last=True):
        if not self:
            raise KeyError('set is empty')
        key = next(reversed(self)) if last else next(iter(self))
        self.discard(key)
        return key

    def __repr__(self):
        if not self: