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想要实现的功能是：识别到路标后返回对应值，没有路标时也返回一个值。
我现在实现了识别路标后返回对应值，但不太会返回没有路标的值，
而且我改过的代码(只加了一个串口通信)在没有路标时也会返回路标值，这怎么办

请在这里粘贴代码
import sensor, image, time, os, tf, math, uos, gc,pyb
import ustruct
from pyb import UART
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.set_windowing((240, 240))
sensor.skip_frames(time=2000)
net = None
labels = None
SendData = 0x00
min_confidence = 0.5
output={
"80":"*****限速80*****",
"n":"*****禁止驶入*****",
"x":"*****禁止鸣笛*****",
}
uart = UART(3,115200)
def sending_data(Data):
    global uart;
    data = ustruct.pack("<bbbb",
                   0x2c,
                   0x12,
                   Data,
                   0x5B)
    uart.write(data);
try:
    net = tf.load("trained.tflite", load_to_fb=uos.stat('trained.tflite')[6] > (gc.mem_free() - (64*1024)))
except Exception as e:
    raise Exception('Failed to load "trained.tflite", did you copy the .tflite and labels.txt file onto the mass-storage device? (' + str(e) + ')')
try:
    labels = [line.rstrip('\n') for line in open("labels.txt")]
except Exception as e:
    raise Exception('Failed to load "labels.txt", did you copy the .tflite and labels.txt file onto the mass-storage device? (' + str(e) + ')')
colors = [
    (255,   0,   0),
    (  0, 255,   0),
    (255, 255,   0),
    (  0,   0, 255),
    (255,   0, 255),
    (  0, 255, 255),
    (255, 255, 255),
]
clock = time.clock()
last_output=0
while(True):
    clock.tick()
    img = sensor.snapshot()
    for i, detection_list in enumerate(net.detect(img, thresholds=[(math.ceil(min_confidence * 255), 255)])):
        if (i == 0): continue
        if (len(detection_list) == 0): continue
        if(i>0):
            print(output[labels[i]])
            if(i == 1):
                SendData = 0x01
            elif(i == 2):
                SendData = 0x02
            elif(i == 3):
                SendData = 0x03
            print("Send:%#x"%SendData)
            sending_data(SendData)