# Filename: socketClient.py  import socket import sys import threading  # Client GUI from tkinter import * import Pmw    # Create a TCP/IP socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # Connect the socket to the port where the server is listening server_address = ('localhost', 10000) print (sys.stderr, 'connecting to %s port %s' % server_address) sock.connect(server_address)  root = Tk() # textDisplay  textDisplay = Pmw.ScrolledText(root)  textDisplay.pack(expand=1, padx=5, pady=5,side = LEFT)  # textInput textInput = Pmw.ScrolledText(root)  textInput.pack(expand=1, padx=5, pady=5,side = LEFT) # Send Button and its callback  def sendMsg(event):   message = socket.gethostname()+':'+ textInput.get()   #print (sys.stderr, 'sending "%s"' % message)   print(message)   sock.sendall(message.encode())   textInput.clear()   #data = sock.recv(100)   #textDisplay.insert(END, data)   #print (sys.stderr, 'received "%s"' % data)    sendBtn = Button(root, text="Send")  sendBtn.bind('<Button-1>', sendMsg)  sendBtn.pack(side = LEFT)  def receiveMsg():   while True:     data = sock.recv(100)     print (sys.stderr, 'client received "%s"' % data)     textDisplay.insert(END, data)     receiveThread = threading.Thread(name='waitForMSG', target=receiveMsg) receiveThread.start()  root.mainloop() 

# Filename: socketServer.py  import socket import sys  # Create a TCP/IP socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # Bind the socket to the port server_address = ('localhost', 10000) print (sys.stderr, 'starting up on %s port %s' % server_address) sock.bind(server_address)  # Listen for incoming connections sock.listen(1)  while True:   # Wait for a connection   print (sys.stderr, 'waiting for a connection')   connection, client_address = sock.accept()    try:     print (sys.stderr, 'connection from', client_address)      # Receive the data in small chunks and retransmit it     while True:       data = connection.recv(16)       print (sys.stderr, 'received "%s"' % data)       if data:         print (sys.stderr, 'sending data back to the client')         connection.sendall(data)       else:         print (sys.stderr, 'no data from', client_address)         break   finally:     # Clean up the connection     connection.close()