strip bug

strip.py

from microbit import *

def get_topic_and_data(b):
    try:
        c = b.rstrip()
        sleep(10)
        # c = b.split(b"\r\n")[0]
        # uart.write(b)
        # uart.write(b'{"a": 18}\r\n') # 稳定
        uart.write(c + b'\r\n')
        # json_str = str(b, 'utf-8')
        # json = eval(json_str)
        
        # display.show(str(json["a"])[-1])
        return "a"
    except:
        pass
        # uart.write(b'error\r\n')
        # display.show(str("!"))


while True:
    r = uart.readline()  # is bytes or none
    if r:
        '''
        try:
            b = r
            uart.write(b)
            b = b.strip()
            # uart.write(b+b"\r\n")
            # uart.write(b+b"\r\n")
            json_str = str(b, 'utf-8')
            json = eval(json_str)
        except:
            pass
            # uart.write(b'error\r\n')
        '''
        d = get_topic_and_data(r)
        if d:
            pass
            # uart.write(bytes(d,'utf-8')+b'\r\n')

看去是 切割的时候 \n\r ,被输入捡过去