Unable to assign IP addresses to server/client in Python Socket Programming -

i'm working on socket level chat assignment requires me have server stores usernames , ip addr&port numbers , give out client needs enable chat between them. new socket programming in python i'm having tough time assigning ip addresses , pickle serializing lists sent server client,

server side:

import pickle import socket udp_ip = '127.0.0.1' udp_port = 8014 fd = socket.socket(socket.af_inet, socket.sock_dgram) fd.bind((udp_ip,udp_port)) x=[]  while true:     r = fd.recvfrom(2048)     x.append(r)     print x     datas=pickle.dumps(x)     reply = r[0]     client_address = r[1]     #fd.sendto(bytearray(reply,"utf-8"), client_address)     fd.sendto(datas,client_address) 

client side:

import pickle import socket fd = socket.socket(socket.af_inet, socket.sock_dgram )   fd.getsockname() udp_ip = '127.0.0.1' udp_port = 8014 b=[]   print "sign-in" message= raw_input("username :") fd.sendto(message, (udp_ip, udp_port)) while(true):     reply = fd.recvfrom(1000)     list1=raw_input("\n").lower().strip()     if list1=="list":          a=pickle.loads(reply)          b.append(a)          print "here list of ip addr , ports",a     else:         print("sorry didn't that.") 

problem 1- need figure out how assign proper ip addresses both client , server. other ip other localhost returns error, `errno99 cannot assign requested address.

problem 2- pickle serialization fantastic , i'm trying list x server client throws error on client side,

`file"client1.py", line 21, in <module>         a=pickle.loads(reply)       file "/usr/lib/python2.7/pickle.py", line 1387, in loads         file = stringio(str)     typeerror: stringio() argument 1 must string or buffer, not tuple 

problem 3- still trying understand how client able retrieve other client's ip , port info server's list , contact other client directly (no server involved). understand bytearrays(can rid of them if use pickle serialization)

i appreciate as possible not asking here code entirely of course, show me way , let me know i'm wrong. links examples perfect.