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POGeneral Python socket questions with several answers
 

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  1. POGeneral Python socket questions with several answers
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    <p>I am trying to use <a href="http://www.devshed.com/c/a/Python/Sockets-in-Python/2/" rel="nofollow noreferrer">an example</a> for a server, but the client can only send one message and then the server will reply with a number.</p> <p>Here is the code.</p> <pre><code>import socket mySocket = socket.socket ( socket.AF_INET, socket.SOCK_STREAM ) mySocket.bind ( ( '', 2000 ) ) mySocket.listen ( 1 ) while True: channel, details = mySocket.accept() print 'We have opened a connection with', details print channel.recv ( 100 ) channel.send ( 'Green-eyed monster.' ) channel.close() </code></pre> <p><strong>Questions:</strong></p> <ol> <li><p>Why is it that whenever the client sends a message to the server, it responds with a number?</p></li> <li><p>How can I use sockets over the Internet, not over LAN?</p></li> <li><p>Is there a way for me to have the server move data from client to client using sockets - somewhat like an <a href="http://en.wikipedia.org/wiki/Instant_messaging" rel="nofollow noreferrer">IM</a> program.</p></li> <li><p>I will most likely host this IM server for my friends on my Mac - will it work between OS's (Mac, PC)</p></li> <li><p>Are there any good libraries to use for this? (I have heard that HTTP is great)</p></li> <li><p>These lines of code are <em>really</em> confusing. How do they work?</p> <pre><code>print channel.recv ( 100 ) channel.send ( 'Green-eyed monster.' ) </code></pre></li> <li><p>Also, when I close the server (using the red X), and reuse the port, it says this:</p> <pre><code>Traceback (most recent call last): File "C:\Users\****\Desktop\Python\Sockets\First Server\server.py", line 3, in &lt;module&gt; mySocket.bind ( ( '', 2003 ) ) File "C:\Python27\lib\socket.py", line 224, in meth return getattr(self._sock,name)(*args) error: [Errno 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted </code></pre></li> <li><p>Lastly, where are some good tutorials for me to understand this better?</p></li> </ol> <p>Sorry for asking so many questions in the same post, but when I posted <a href="https://stackoverflow.com/questions/14764294/how-to-change-the-shutdown-message-for-windows-using-python">this</a> and <a href="https://stackoverflow.com/questions/14764126/how-to-make-a-python-script-which-can-logoff-shutdown-and-restart-a-computer">this</a> people got mad with me for posting about similar problems in different problems.</p> <p>Python version: Python 2.7.3</p>
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