from socket import * # get socket constructor and constants myHost = '' # '' = all available interfaces on host myPort = 50007 # listen on a non-reserved port number
sockobj = socket(AF_INET, SOCK_STREAM) # make a TCP socket object sockobj.bind((myHost, myPort)) # bind it to server port number sockobj.listen(5) # listen, allow 5 pending connects
while True: # listen until process killed connection, address = sockobj.accept() # wait for next client connect print('Server connected by', address) # connection is a new socket while True: data = connection.recv(1024) # read next line on client socket if not data: break # send a reply line to the client connection.send(b'Echo=>' data) # until eof when socket closed connection.close()
client
import sys from socket import * # portable socket interface plus constants serverHost = 'localhost' # server name, or: 'starship.python.net' serverPort = 50007 # non-reserved port used by the server
message = [b'Hello network world'] # default text to send to server # requires bytes: b'' or str,encode() if len(sys.argv) > 1: serverHost = sys.argv[1] # server from cmd line arg 1 if len(sys.argv) > 2: # text from cmd line args 2..n message = (x.encode() for x in sys.argv[2:])
sockobj = socket(AF_INET, SOCK_STREAM) # make a TCP/IP socket object sockobj.connect((serverHost, serverPort)) # connect to server machine port
for line in message:
sockobj.send(line) # send line to server over socket
data = sockobj.recv(1024) # receive line from server: up to 1k
print('Client received:', data) # bytes are quoted, was x, repr(x)
sockobj.close() # close socket to send eof to server
