def get_slot(self):
        return extract_literal(self.slot_expr)
s -> (s0,s1), (s1,s2), (s2, s3), ...
dataset/ETHPy150Open edoburu/django-fluent-contents/fluent_contents/templatetags/fluent_contents_tags.py/PagePlaceholderNode.get_slot--crossover with--dataset/ETHPy150Open aarongarrett/inspyred/docs/moonshot.py/pairwise