@classmethod
    def from_obj(cls, obj, return_obj=None):
        if not obj:
            return None
        if return_obj is None:
            return_obj = cls()

        return_obj.start_time = DateTimeWithPrecision.from_obj(obj.Start_Time)
        return_obj.end_time = DateTimeWithPrecision.from_obj(obj.End_Time)
        return return_obj
dataset/ETHPy150Open STIXProject/python-stix/stix/indicator/valid_time.py/ValidTime.from_obj/original