Unlike TCP, UDP doesn't check for errors in the exchanged datagram. We can create UDP client/servers similar to the TCP client/servers. The only difference is you have to specify SOCK_DGRAM instead of SOCK_STREAM when you create the socket object.

Let us create a UDP server. Use the following code to create the UDP server:

from socket import socket, AF_INET, SOCK_DGRAM
maxsize = 4096

sock = socket(AF_INET,SOCK_DGRAM)
sock.bind(('',12345))
while True:    
  data, addr = sock.recvfrom(maxsize)
    resp = "UDP server sending data"    
  sock.sendto(resp,addr)

Now, you can create a UDP client to send some data to the UDP server, as shown in the following code:

from socket import socket, AF_INET, SOCK_DGRAM

MAX_SIZE = 4096
PORT = 12345

if __name__ == '__main__':
    sock = socket(AF_INET,SOCK_DGRAM)
    msg = "Hello UDP server"
    sock.sendto(msg.encode(),('', PORT))
    data, addr = sock.recvfrom(MAX_SIZE)
    print("Server says:")
    print(repr(data))

In the preceding code snippet, the UDP client sends a single line of text Hello UDP server and receives the response from the server. The following screenshot shows the request sent from the client to the server:

The following screenshot shows the server's response sent to the client. After inspecting UDP client/server packets, we can easily see that UDP is much simpler than TCP. It's often termed as a connectionless protocol as there is no acknowledgment or error checking involved.