Python: I can't import a module even though it's in site-packages

Question

I'm following the tutorial "Think Python" and I'm supposed to install the package called swampy. I'm running python 2.7.3 although I also have python 3 installed. I extracted the package and placed it in site-packages:
C:\Python27\Lib\site-packages\swampy-2.1.1
C:\Python31\Lib\site-packages\swampy-2.1.1
But when i try to import a module from it within python:

import swampy.TurtleWorld

I just get no module named swampy.TurtleWorld.
I'd really appreciate it if someone could help me out, here's a link to the lesson if that helps:
http://www.greenteapress.com/thinkpython/html/thinkpython005.html

Answer 1

If anyone else is having trouble with this on Windows, I just added my sites-package directory to my PATH variable and it worked like any normal module import.

C:\Python34\Lib\site-packages

Hope it helps.

Answer 2

I extracted the package and placed it in site-packages:

No, that's the wrong way of "installing" a package. Python packages come with a setup.py script that should be used to install them. Simply do:

python setup.py install

And the module will be installed correctly in the site-packages of the python interpreter you are using. If you want to install it for a specific python version use python2/python3 instead of python.