Install zope.interface for Twisted

Twisted uses Zope Interface to define and document APIs.

1. Download it from here. It's in egg format. Choose the appropriate Python version with ours.
2. To install .egg, we need 'Easy Install' that is part of setuptools. So, we have to install setuptools first. Download it from here. Choose the appropriate Python version with ours. Because our aim is to be able to install .egg, choose setuptools in .exe format.
3. Run the installer. 
4. It will install a new executable file called 'easy_install.exe' under Python's 'Scripts' folder.
5. To install the zope.interface in .egg format, I did the following in Command Line:

c:\Python26\Scripts\easy_install.exe c:\zope.interface-3.6.1-py2.6-win32.egg

Now we can use the zope.interface for our twisted.

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Further readings:

• Twisted.
• Python eggs.
• Easy Install.