In Python I am trying to run a server and a client seperately and get them to co

Question

In Python I am trying to run a server and a client seperately and get them to communicate. I have the server running in Terminal on a mac and I am running the client on a seperate instance of terminal. I can't figure out how to get them to communicate. I need to know the correct host address, port number and what I am doing wrong.

#Server

#!/usr/bin/python
import socket
import sys

def main():
    my_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    if len(sys.argv) == 2:
        port = sys.argv[1]
    else:
        port = input("Enter port number:")
    server_address = ('localhost', int(port))
    print(sys.stderr, 'starting up on %s port %s' % server_address)
    my_socket.bind(server_address)
    message_count = 0
    message = ["Mongo only pawn in the game of life --Mongo",
   "Your mother was a hamster and your father smelt of elderberries! -The Holy Grail French",
   "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. - The Hitchhiker's Guide to the Galaxy",
   "No matter where you go, there you are - Buckaroo Banzai"]

    while True:
        print (sys.stderr, '/nwaiting to receive message')
        data, address = my_socket.recvfrom(4096)

        print(sys.stderr, 'received %s bytes from %s' % (len(data), address))
        print(sys.stderr, data)

        if data:
            sent = my_socket.sendto(message[message_count].encode(), address)
            message_count += 1
            if message_count > len(message) - 1:
                message_count = 0
            print(sys.stderr, 'sent %s bytes back to %s' % (sent, address))

if __name__== "__main__":
    main()

#Client

#!/usr/bin/python
import socket
import sys

def main():
    my_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    if len(sys.argv) == 3:
        host = sys.argv[1]
        port = sys.argv[2]
    else:
        host = input("Enter the host address:")
        port = input("Enter port number:")

    if host == 'localhost':
        host = '127.0.0.1'

    dest_address = (host, int(port))
  
    count = 0
    rcvdQOTD = False
    while count < 3:
        try:
            print(sys.stderr, 'Sending ')
            my_socket.settimeout(10)
            sent = my_socket.sendto(' '.encode(), dest_address)

            print(sys.stderr, 'Waiting to receive')
            data, server = my_socket.recvfrom(4096)
            my_socket.settimeout(None)
            if host in server:
                print(sys.stderr, 'received "%s"' % data)
                rcvdQOTD = True
                count = 3
            else:
                print('Wrong server')

        except socket.timeout:
            print ("Timeout from server")
            count += 1

    my_socket.close()

    if rcvdQOTD == False:
        print("Tried to connect once and retried twice. Connection timed out")
    finished = input("Finished?")
  

if __name__== "__main__":
    main()

Explanation / Answer

serever.py: include these steps at begning of your server-side

import socket                   # Import socket module
port = 60000                    # Reserve a port for your service.
s = socket.socket()             # Create a socket object
host = socket.gethostname()     # Get local machine name
s.bind((host, port))            # Bind to the port
s.listen(5)

-------------------------------------------------------------------------------------

client.py: include these steps at begning of your client-side

import socket                   # Import socket module
s = socket.socket()             # Create a socket object
host = socket.gethostname()     # Get local machine name
port = 60000                    # Reserve a port for your service.
s.connect((host, port))
s.send("Hello server!")

Note : if Port no. should be used same e.g. 60000 at both-side.

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