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Python Chat Client getting stuck after entering message

P: 1
Alright, let me explain my issue to you:

So I made a chat client in Python following some tutorials, but I quickly was limited with it. The problem is that because of this process called blocking, when it came time for the client to receive a message, the whole process would stop until a reply did come through.

So I went along asking some questions here and there, and looking for a way to make the client work so that the client could write as many messages as they wanted without having to wait for a reply first.

So I wrote this:
Expand|Select|Wrap|Line Numbers
  1. from socket import *
  2. import select
  3. import sys #because why not?
  4. import threading
  5. import queue
  7. print("New Chat Client Using Select Module")
  9. HOST = input("Host: ")
  10. PORT = int(input("Port: "))
  12. s = socket(AF_INET,SOCK_STREAM)
  14. print("Trying to connect....")
  15. s.connect((HOST,PORT))
  16. s.setblocking(0)
  17. # Not including setblocking(0) because select handles that. 
  18. print("You just connected to",HOST,)
  20. # Lets now try to handle the client a different way!
  22. while True: 
  23.     Incoming_data = [s]
  24.     Exportable_data = []
  25.     Exceptions = []
  27.     User_input = input("Your message: ")
  29.     rlist,wlist,xlist =,Exportable_data,Exceptions)
  31.     if User_input == True:
  32.         Exportable_data += [User_input]
  33.         print(Exportable_data)
  35.     if wlist:
  36.         if Exportable_data is True:
  37.             print(Exportable_data)
  38.             i.send(Exportable_data)
  40.     if rlist:
  41.         data = i.recv(1024)
  42.         if data == "":
  43.             continue
Trouble is when I run this, it just gets stuck after you type in your input, I added some print commands in the proceeding if functions to see if it could complete any of them, but it doesn't. It seems to get stuck right away.
Mar 8 '13 #1
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1 Reply

Expert 100+
P: 127
Have you had a look at the select function? (Which are found in most operating systems?)
Jun 2 '13 #2

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