TypeError:需要一个类似字节的对象，而不是“str"

问题描述

The following is the code that tries to modify the input supplied by a user by using sockets:

from socket import *

serverName = '127.0.0.1'
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_DGRAM)
message = input('Input lowercase sentence:')
clientSocket.sendto(message,(serverName, serverPort))
modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
print (modifiedMessage)
clientSocket.close()

When I execute it and supply input the following error occurs:

Input lowercase sentence:fdsgfdf
Traceback (most recent call last):
  File "C:srinath filesNETWORKSUDPclient.py", line 6, in <module>
    clientSocket.sendto(message,(serverName, serverPort))
TypeError: a bytes-like object is required, not 'str'

What can I do to solve this?

解决方案

This code is good for Python 2. But in Python 3, results in bit encoding error. I was trying to make a simple TCP server and encountered the same problem. Encoding solves this. Try this with sendto command.

clientSocket.sendto(message.encode(),(serverName, serverPort))

Similarly you should use .decode() to receive the data on the UDP server side, if you want to print it exactly as it was sent.