TypeError: a bytes-like object is required, not 'str'

Question

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 files\NETWORKS\UDPclient.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?

Answer 1

This code is probably good for Python 2. But in Python 3, this will cause an issue, something related to bit encoding. I was trying to make a simple TCP server and encountered the same problem. Encoding worked for me. Try this with sendto command.

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

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