我用编码的消息rsa.encrypt，但当时我无法加密的数据转换为一个str带.decode()。有点奇怪，因为加密的数据是字节字符串，将其转换为不会有任何问题str。

data = [self.id, data, self.my_pubkey] # actually don't care about type of components, they are correct

我的代码：

import json
import rsa

def msg(query_type, data):
    if query_type == 'PubKey':
        try:
            query = {"Type": "PubKey",
                     "Message": {"PubKey": data[0],
                                 "Id": data[1]
                                 }
                     }
            to_send = json.dumps(query)
            to_send = to_send.encode()
            return to_send
        except Exception as ex:
            print("Error in creating message")
            print(ex)
    elif query_type == 'Message':
        try:
            encrypted_data = rsa.encrypt(data[1].encode('utf-8'), data[2])
            print(encrypted_data.decode('utf-8'))
            query = {"Type": "Message",
                     "Message": {"Id": data[0],
                                 "Data": str(encrypted_data)[2:-1]
                                 }
                     }
            pub = rsa.lo
            to_send = json.dumps(query)
            to_send = to_send.encode()
            return to_send
        except Exception as ex:
            print("Error in creating message")
            print(ex)
        except Exception as ex:
            to_send = str(ex).encode()
            return to_send

但是，我收到此错误：

Error in creating message
'utf-8' codec can't decode byte 0xfc in position 5: invalid start byte
Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Users\vladi\AppData\Local\Programs\Python\Python37\lib\threading.py", line 926, in _bootstrap_inner
    self.run()
  File "C:\Users\vladi\AppData\Local\Programs\Python\Python37\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\vladi\Documents\Programming\python\Server_Client\Client\client.py", line 28, in send
    self.sock.send(str(len(data_to_send)).encode())
TypeError: object of type 'NoneType' has no len()```