Python_Socket_Programming_Socket_Server_Client_Side.py

# Python Socket Programming.
# Of the various forms of Inter Process Communication (IPC), sockets are by far the most popular. 
# The combination of sockets with INET makes talking to arbitrary machines around the world unbelievably 
# easy.
# The client application (your browser, for example) uses “client” sockets for client-server communication; 
# the web server it’s talking to uses both “server” sockets and “client” sockets. 
# socketserver — A framework for network servers
# The difference is that the readline() call in the second handler will call recv() multiple times until it 
# encounters a newline character, while the single recv() call in the first handler will just return what has 
# been sent from the client in one sendall() call.
# Client Side:
 
import socket
import sys

HOST, PORT = "localhost", 9999
data = " ".join(sys.argv[1:])

# Create a socket (SOCK_STREAM means a TCP socket)

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:

    # Connect to server and send data

    sock.connect((HOST, PORT))
    sock.sendall(bytes(data + "\n", "utf-8"))

    # Receive data from the server and shut down

    received = str(sock.recv(1024), "utf-8")

print("Sent:     {}".format(data))
print("Received: {}".format(received))