ImportError: dynamic module does not define module export function (PyInit_cv2)

Python3 libraries usually can be found in: /usr/lib/python3/dist-packages

I found out that the library cv2.cpython-34m.so is needed for Python3.4. But this file wasn't be contained in my default library directory.

In my environment, this library was stored in /usr/local/lib/python3.4/dist-packages/

So I created a symbolic link. Try it with:

cd /usr/lib/python3/dist-packages
sudo ln -s /usr/local/lib/python3.4/dist-packages/cv2.cpython-34m.so

python3
>>> import cv2

I hope, this helps you