[PySide] How to install correctly on Ubuntu 13.10

[calawap]

I'm running Ubuntu 13.10 with Python 3.3.4, installed via pyenv.

When I run this command:
sudo apt-get install python3-pyside
PySide is installed to /usr/lib/python3/dist-packages/PySide.

I can make a symlink to that directory in my pyenv Python 3.3's site-packages directory. This allows me to import PySide in Python, but I get an ImportError when trying to import QtGui from PySide:
ImportError: cannot import name QtGui

Ditto for similar modules as well. The PySide directory includes the QtGui.cpython-33m-i386-linux-gnu.so file, but it's not being accessed, I guess. I have fiddled with PYTHONPATH and LD_LIBRARY_PATH without success. I can't find much available information on this, so any advice would be appreciated.