类型错误：Unicode字符串不支持，请编码为字节： '\ X08'

Question

我看到这个答案：

• python3 pySerial TypeError: unicode strings are not supported, please encode to bytes:
• Arduino 'Error communicating...unicode strings are not supported, please encode to bytes' PySerial

但我不理解它。在我的情况下，我有chr(code)进入serial.write功能。

我会写b'chr(8)'吗？

import serial 
import pygame 
from pygame.locals import * 


class RCTest(object): 
def __init__(self): 
    pygame.init() 
    screen = pygame.display.set_mode((400, 300)) 
    self.ser = serial.Serial('COM3', 9600, timeout = 1) 
    self.send_inst = True 
    self.steer() 

def steer(self): 

    while self.send_inst: 

     for event in pygame.event.get(): 
      print("entered for loop") 

      if event.type == KEYDOWN: 
       print("entered event.type == KEYDOWN") 

       key_input = pygame.key.get_pressed() 
       print("pygame.key.get_pressed() running") 

       # complex orders 
       if key_input[pygame.K_UP] and key_input[pygame.K_RIGHT]: 
        print("Forward Right") 
        self.ser.write((chr(6)) 

       elif key_input[pygame.K_UP] and key_input[pygame.K_LEFT]: 
        print("Forward Left") 
        self.ser.write((chr(4)) 

       # simple orders 
       elif key_input[pygame.K_UP]: 
        print("Forward") 
        self.ser.write((chr(8)) 

       elif key_input[pygame.K_DOWN]: 
        print("Reverse") 
        self.ser.write((chr(2)) 

       # exit 
       elif key_input[pygame.K_x] or key_input[pygame.K_q]: 
        print('Exit') 
        self.send_inst = False 
        self.ser.write((chr(0)) 
        self.ser.close() 
        break 

      elif event.type == pygame.KEYUP: 
       self.ser.write((chr(0)) 


if __name__ == '__main__': 
    RCTest() 

运行程序后，我按下了ARROWKEY。

entered for loop 
entered for loop 
entered for loop 
Traceback (most recent call last): 
entered event.type == KEYDOWN 
    File "C:/Users/../rc_control_test.py", line 58, in <module> 
pygame.key.get_pressed() running 
    RCTest() 
Reverse 

Answer 1

编码为字节：

"string".encode() 
>> b'string' 

因此，你也许可以这样写：

self.ser.write(("string".encode())) 

另外，如果你想在一个时间来写一个字：

self.ser.write("A".encode())