python 判断时间是否在指定时间内

def isDuringThatTime(startTime, endTime, zhongTime):
    start_time = datetime.datetime.strptime(startTime, '%Y-%m-%d %H:%M:%S')
    end_time = datetime.datetime.strptime(endTime, '%Y-%m-%d %H:%M:%S')
    now_a = str(dateutil.parser.parse(zhongTime))
    now_time = datetime.datetime.strptime(now_a[:18], '%Y-%m-%d %H:%M:%S')
    if start_time < now_time < end_time:
        return True
    return False