将python 2.7x代码移植到python 3.7x时，Python3 JSON编码错误“没有编码的字符串参数” >> [

Question

我正在将python 2.7x代码移植到python 3.7x。此代码尝试使用TCP套接字将一些数据发布到服务器。创建JSON.dumps（data）时出现编码错误。

 try:
         sei_nal_unit = create_sei_nal_unit(camera_config.SEI_UUID_CAMERA_SETTINGS, 
                        json.dumps(capture_settings) )
         #connection_filehandle.write(sei_nal_unit)
     except Exception as e:
          log.write("socket Thread TCP - exception in sending data [%s]" % (str(e)) ) 

   def encode_multibyte_value(value):
        """ encode values >= 255 as 0xff0xff..0xresidual """

        encoded = bytearray()

        while (value >= 255):
            encoded += bytearray(chr(255))
            value -= 255

        encoded += bytearray(chr(value))

        return encoded

    def escape_bytearray(input):
        """ escape 000 to 0030, 001 to 0031, 002 to 0032 and 003 to 0033 """
        output = bytearray()

        history1 = None
        history2 = None

        for b in input:
            if (history1==0) and (history2==0) and (b <= 3):
                output += chr(3)
                history1 = 3
                history2 = b
            else:
                history1 = history2
                history2 = b

            output += chr(b)    

        return output


       def create_sei_nal_unit(uuid, payload_string):
        """ create a 'user data unregistered' SEI nal unit in a bytearray """
        try:
            assert(bytearray == type(uuid))
            uuid_length = len(uuid)
            assert(16 == uuid_length)
            nal_unit_prefix = bytearray(b'\x00\x00\x00\x01')
            nal_unit_type = bytearray(chr(6))                   # 6 = SEI
            encoded_payload_type = encode_multibyte_value(5)    # 5 = 'user data unregistered'
            payload = bytearray(payload_string)
            encoded_payload_size = encode_multibyte_value(uuid_length + len(payload))
            escaped_payload = escape_bytearray(uuid + payload)
            trailing_bits = bytearray(b'\x80')
            sei_nal_unit = ( nal_unit_prefix
                       + nal_unit_type
                       + encoded_payload_type
                       + encoded_payload_size
                       + escaped_payload
                       + trailing_bits )
            return sei_nal_unit
        except Exception as e:
            print(str(e))

错误是

socket Thread TCP - an exception in sending data [string argument without an encoding]

JSON文件为

capture_settings = [{"framerate": 30, "width": 1280, "height": 720, "bitrate": 17000000, "overlay": false, "gop_size": 30}]

我没有找到任何线索，尽管我尝试了很多方法但没有希望。谢谢高级。

我正在将python 2.7x代码移植到python 3.7x。此代码尝试使用TCP套接字将一些数据发布到服务器。创建JSON.dumps（data）时出现编码错误。尝试：...

Answer 1

json.dumps()调用返回一个字符串。通过TCP套接字发送之前，必须将其编码为bytes。最简单的方法是使用：