好的，谢谢你~~~~~~~~~

import time,pyb
from pyb import UART
led = pyb.LED(3)
uart = UART(3, 9600, timeout_char=1000)                        
uart.init(9600, bits=8, parity=None, stop=1, timeout_char=1000) 


while(True):
    #led.on()
    uart.write('1\r\n')
    if uart.any():
        print(uart.read(1))
    time.sleep(100)