类型错误：不支持unicode字符串，请编码为字节：'\x08'

Question

我读到这个答案：

• 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

但我不明白。在我的例子中，我有chr(code)进入serial.write函数。

我写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，我按下箭头键。

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

要编码为字节：

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

因此，你可以这样写：

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

否则，如果一次只想写一个字符：

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