udp_client.py

• We change the socket type to SOCK_DGRAM to indicate that we will be using sending data via the UDP (line 6).
  
• Also, notice that there is no connect() method beforehand, since we do not need to connect to a server beforehand using UDP. This is because UDP is a connectionaless protocol.
  
• The last step is to call the recvfrom() method to receive UDP data back. This returns both the data and the details of the remote host and port (line 9).
  

tcp_server.py

• Firstly, we pass in the IP address and port we want the server to listen on (line 9).
  
• Next, we tell the server to simply start listening with a max backlog of connections set to 5 (line 10). Now ther server waits for a connection.
  
• Once the clinet connects, we get the client socket in the client variable and the remote connection details in teh address variable.
  
• We tehn start the thread to handle the client connection (line 17).
  
• The handle_client function performs rec() and then sens a simple message back to the client.