So, initially, I just had python 3.5 from the anaconda installation and all was fine. Then I was following a tutorial that suggested the use of enthought canopy, which used python 2.7. After this I did a 'pip install opencv-python' and that installed the 2.7 version of the library. I should note, I am on Ubunutu 16 desktop for development.
I cannot seem to find a way for installing opencv and possibly cv2 for python3, the version installed in my user directory. Maybe I should remove enthought canopy. But I will still need to find the correct versions of opencv, cv2 for anaconda3. Thanks in advance for any help, Bruce