串口的函数写错了 但是我改回来了 还是不行 还是一样的错误

我已经崩溃了
# Single Color RGB565 Blob Tracking Example
#
# This example shows off single color RGB565 tracking using the OpenMV Cam.

import sensor, image, time, math
from pyb import UART

threshold_index = 0 # 0 for red, 1 for green, 2 for blue
foxiang=0
shuihu=0
dingshuji=0
output_shuju=0

# Color Tracking Thresholds (L Min, L Max, A Min, A Max, B Min, B Max)
# The below thresholds track in general red/green/blue things. You may wish to tune them...
thresholds = [(100, 10, 127, -128, -33, -128), # 订书机
              (34, 58, -128, 127, 32, 127), # 佛像阈值
              (7, 58, 15, 38, -30, 11)] #紫色水壶阈值

uart = UART(3, 115200)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # must be turned off for color tracking
sensor.set_auto_whitebal(False) # must be turned off for color tracking
clock = time.clock()

    
while(True):
    clock.tick()
    img = sensor.snapshot()
    for blob    in  img.find_blobs([thresholds[1]], pixels_threshold=2000, area_threshold=2000,merge=True):
            foxiang=blob
            img.draw_rectangle(blob.rect(),(255,0,0))        #画框
            img.draw_cross(blob.cx(), blob.cy())    #通过读取到的坐标在图像中心画十字
    if foxiang:
             print("佛像坐标为",blob[5],blob[6])
    for blob    in  img.find_blobs([thresholds[2]], pixels_threshold=2000, area_threshold=2000,merge=True):
                 shuihu=blob
                 img.draw_rectangle(blob.rect(),(0,255,0)) 
                 img.draw_cross(blob.cx(), blob.cy())
    if  shuihu   :
        print("水壶的坐标为",blob[5],blob[6])
    for blob    in  img.find_blobs([thresholds[0]], pixels_threshold=300, area_threshold=300,merge=True):
                     dingshuji=blob
                     img.draw_rectangle(blob.rect(),(0,0,255)) 
                     img.draw_cross(blob.cx(), blob.cy())
    if  dingshuji   :
         print("蓝色物体的坐标为",blob[5],blob[6])
         output_shuju="[%d,%d]" % (blob.cx(),blob.cy())
         usrt.write(output_shuju'\r\n')
    print(clock.fps())里粘贴

为什么我这样索引会有错误呢？我已经赋值给他了 不是应该跟blob的数值相等吗？

threshold_index = 0 # 0 for red, 1 for green, 2 for blue
foxiang=0
shuihu=0
dingshuji=0

# Color Tracking Thresholds (L Min, L Max, A Min, A Max, B Min, B Max)
# The below thresholds track in general red/green/blue things. You may wish to tune them...
thresholds = [(100, 20, -122, 127, -128, 127), # 黑色阈值
              (34, 58, -128, 127, 32, 127), # 佛像阈值
              (7, 58, 15, 38, -30, 11)] #紫色水壶阈值


sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # must be turned off for color tracking
sensor.set_auto_whitebal(False) # must be turned off for color tracking
clock = time.clock()


while(True):
    clock.tick()
    img = sensor.snapshot()
    foxiang=img.find_blobs([thresholds[1]])
    if foxiang:
        print("坐标为",foxiang[5])
    print(clock.fps())