def copy(self):
        result = Requirements()
        for name, req in self.items():
            result[name] = req
        return result
Trivial filter - will probably become more complex as time goes by!
dataset/ETHPy150Open conan-io/conan/conans/model/requires.py/Requirements.copy--crossover with--dataset/ETHPy150Open jdriscoll/django-photologue/photologue/managers.py/SharedQueries.is_public