OpenCV install on Python 3.6: ModuleNotFoundError
Use pip install -U opencv-python
I am getting the following error when using import cv2:
ModuleNotFoundError: No module named 'cv2'
My version of Python is 3.6 64 bit. I have downloaded the whl file to install it via pip manually, and have also installed it with pip install opencv-python however I still get ModuleNotFoundError. 
pip outputs Requirement already satisfied: opencv-python in c:\...\python36\site-packages
Help would be much appreciated.