Python help: Sockets

[Chittle]

Hello I have been working for the last few days on networking and sockets in python for my Final Project for school. While I am working on the code at home it works perfectly but when i get to school the client is not able to connect to the host, but at school I am able to connect to the same computer that I am on, it only doesn't work when i am trying to get it to connect to seperate computers. so I was just wondering if anybody had any ideas. Heres the code

code:

import socket import time class myNetwork:     def __init__(self):         self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)         self.host = socket.gethostname()         self.port = 4002             def isHost(self):         self.s.bind((socket.gethostname(), self.port))         self.s.listen(5)         print "Ip address:", socket.gethostbyname(socket.gethostname())     def client (self):         self.host = raw_input("Please enter the IP address of the host: ")         if self.host == "":             self.host = "192.168.0.103"         self.s.connect((self.host, self.port))     def connect(self):         self.conn, self.addr = self.s.accept()         print "Connected"         print "Client is at", self.addr net = myNetwork() hostClient = raw_input("Is this a host or a client? ") if hostClient.lower() == "host":     net.isHost()     net.connect()     data = raw_input("Please enter a message: ")     net.conn.sendall(data) else:     net.client()     data = net.s.recv(1000000)     print data     print "received", len(data), "bytes" time.sleep(5) net.conn.close()

I would like to point out that I have no 'evil' intent for networking at school I just want my Final Project to work. A thank you in advance to any help

Moderation: please modify your original code when someone suggests a way to preserve code formatting from now on. - wtd

[rdrake]

Have you run into this situation using multiple computers? If it's a far away machine it could be on a different subnet and not be configured to route packets between them.

Just a complete stab in the dark.

Oh, and it's generally advisable to use either [ syntax = "python" ] [ /syntax ] or [ code ] [ /code] tags, otherwise your code will not be displayed with the correct font and the indentation will not be preserved. This normally helps with readability, but in Python indents are required .

[Zeroth]

This is actually more of a networking issue. What kind of code does the host have on its end? Or the client? Second of all, you should understand there may be firewalls preventing your communications. You should talk to your teacher about the problem you are facing.

I do notice that in one spot you hard-code the IP address, and this may be an issue too.

[Chittle]

Okay thanks for replying guys this is actually my first topic ever on compsci.ca so thanks for explaining how to make my code look nice
I would like to point out a few things about my code: This code works for both the client or the host it asks which it is as soon as it is run and then runs the approapriate code after that
and also that the hard coded IP address is my computer which it only changes to that if I don't type in anything for the IP address when it asks for it (Whenever i get lazy)


And this problem only occurs at school and the computer are not far away from eachother at all they are actually right next to eachother.

[Chittle]

Problem solved: I booted ubuntu off of my flash drive and as long as that computer is the host there are no problems with connections

[andrew.]

So it was probably some kind of school computer firewall, right? Some program the school board installed on the computer?

[Chittle]

Yeah im guessing it was some program that booted up on windows when I logged in.