title: ImportError: No module named zope.interface
body: <p>I am trying to run server for iphone using <a href="http://www.raywenderlich.com/3932/how-to-create-a-socket-based-iphone-app-and-server">http://www.raywenderlich.com/3932/how-to-create-a-socket-based-iphone-app-and-server</a></p>
  
  <p>My machine is mac 10.6.8
  Python version : 2.7.3
  I dont have any knowledge regarding python.
  i have installed Twisted-12.1.0 additionally but still i am getting this error.</p>
  
  <p>Traceback (most recent call last):
    File "chatserver.py", line 1, in 
      from twisted.internet.protocol import Protocol, Factory
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/protocol.py", line 15, in 
      from zope.interface import implements
  ImportError: No module named zope.interface</p>
  
  <p>later i have downloaded zope.app.wsgi-3.15.0 4 but i dont know how to use it.</p>