识别数字后的数据通过串口发送到电脑出现问题

[libarwz]

用识别数字例程识别数字，想将输出的数据经串口传送到电脑，代码如下

import sensor, image, time
from pyb import UART

sensor.reset()                          # Reset and initialize the sensor.
sensor.set_contrast(3)
sensor.set_pixformat(sensor.GRAYSCALE)  # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.VGA)        # Set frame size to QVGA (320x240)
sensor.set_windowing((128, 128))        # Set 128x128 window.
sensor.skip_frames(time = 2000)         # Wait for settings take effect.
sensor.set_auto_gain(False)
sensor.set_auto_exposure(False)

uart = UART(3, 115200)


while(True):
    img = sensor.snapshot()
    # NOTE: Uncomment to detect dark numbers on white background
    # img.invert()
    out = img.find_number(roi=(img.width()//2-14, img.height()//2-14, 28, 28))
    img.draw_rectangle((img.width()//2-15, img.height()//2-15, 30, 30))
    if out[1] > 5: # Confidence level
        print("Number: %d Confidence: %0.2f" %(out[0], out[1]))
        
   uart.write(out[0]'\n')
  time.sleep(1000)

发现串口部分代码不正确，但不知道要怎么改，求大神指点一二。

[kidswong999]

if out[1] > 5: # Confidence level
    print("Number: %d Confidence: %0.2f" %(out[0], out[1]))
    uart.write(out[0]+'\n')

[libarwz]

照着修改后出现这样的错误

[kidswong999]

uart.write(str(out[0])+'\n')