Programming with Sockets

Let's modify our previous TCP client to send arbitrary data to any server.
The following is an example of an enhanced TCP client:

import socket

HOST = 'localhost'

PORT = 12345

BUFSIZ = 256

if __name__ == '__main__':

client_sock = socket.socket(socket.AF_INET,

socket.SOCK_STREAM)

host = input("Enter hostname [%s]: " %HOST) or HOST

port = input("Enter port [%s]: " %PORT) or PORT

sock_addr = (host, int(port))

client_sock.connect(sock_addr)

payload = 'GET TIME'

try:

while True:

client_sock.send(payload.encode('utf-8'))

data = client_sock.recv(BUFSIZ)

print(repr(data))

more = input("Want to send more data to server[y/n]

:")

if more.lower() == 'y':

payload = input("Enter payload: ")

else:

break

except KeyboardInterrupt:

print("Exited by user")

client_sock.close()

If you run the preceding TCP server in one console and the TCP client in another
console, you can see the following interaction between the client and server.
After running the TCP server script you will get the following output:

python 7_3_tcp_server.py

Server waiting for connection...

Client connected from: ('127.0.0.1', 59961)