new_contents: import socket
  import sys
  from thread import *
  
  
  c= raw_input('ENTER T for tcp , U for UDP servers\n')
  if c=='T':
  
      HOST = ''   # Symbolic name meaning all available interfaces
      PORT = 5558 # Arbitrary non-privileged port
       
      s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      print 'Socket created'
  
       
  
      #Bind socket to local host and port
      try:
          s.bind((HOST, PORT))
      except socket.error , msg:
          print  'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
          sys.exit()
          
           
         
  
  
      #Start listening on socket
      print  'Socket bind complete'    
      s.listen(10)
      print 'Socket now listening'
  
      #Function for handling connections. This will be used to create threads
      def clientthread(conn,addr):
            #infinite loop so that function do not terminate and thread do not end.
       while 1:
              #Receiving from client
          try:
            data =conn.recv(1024)
            if not data:
                 break
           
            data1,data2=data.split(',')
            data3=int(data1) + int(data2)
            reply=str(data3)
            conn.sendall(reply)
          except:
              sys.exit()
          
           
          #came out of loop
          conn.close()#fin from server
          print 'connection with ' +str(addr)+ ' closed\n'
  
          
         #now keep talking with the client
       
      while 1:
  
        #wait to accept a connection - blocking call
        
          conn, addr = s.accept()
          print 'Connected with ' + addr[0] + ':' + str(addr[1])+'\n'
        
        #start new thread takes 1st argument as a function name to be run, second is the tuple of arguments to the function.
          start_new_thread(clientthread ,(conn,addr[1],))
       
          
  
  
          
  elif c=='U':
      
      HOST = ''   # Symbolic name meaning all available interfaces
      PORT = 6667 # Arbitrary non-privileged port
       
      # Datagram (udp) socket
      try :
          s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
          print 'Socket created'
      except socket.error, msg :
          print 'Failed to create socket. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
          sys.exit()
       
       
      # Bind socket to local host and port
      try:
          s.bind((HOST, PORT))
      except socket.error , msg:
          print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
          sys.exit()
           
      print 'Socket bind complete'
  
      def clientthread(d):
            #infinite loop so that function do not terminate and thread do not end.
          while True:
               
              #Receiving from client
              data=d[0]
             
              addr=d[1]
             
              data1,data2=data.split(',')
              data3=int(data1) + int(data2)
              reply=str(data3)
              s.sendto(reply , addr)
             
  
      while 1:
         
      #start new thread takes 1st argument as a function name to be run, second is the tuple of arguments to the function.
   
            
            d =s.recvfrom(1024)
            if not d:
                 break
            addr=d[1]
            print d
            start_new_thread(clientthread, (d,))
   
     
            
            
       
  else:
   print 'invalid option'
  
  
subject: Create Server.py