def choices_from_params(self):
        out = []
        for p in self.params.getlist(self.query_param):
            try:
                choice = self.choice_from_param(p)
                out.append(choice)
            except __HOLE__:
                pass
        for p in self.params.getlist(self.query_param + '--isnull'):
            out.append(self.choice_from_param(None))
        return out
dataset/ETHPy150Open ionelmc/django-easyfilters/src/django_easyfilters/filters.py/Filter.choices_from_params