patients.py 文件源码

def primary_patient_number(self):
        patient_numbers = [x for x in self.patient_numbers if x.number_group.is_recruitment_number_group]

        if len(patient_numbers) == 0:
            return None

        def by_modified_date(x):
            return (x.modified_date or datetime.min, x.id)

        return max(patient_numbers, key=by_modified_date)