ModuleNotFoundError: No module named 'cv2'

In Windows 10 you can install it as

pip install opencv-python

this will allow you to import cv2 module

Faced with the same issue on Windows 10 I downloaded the open cv binary from the Unofficial Windows Binaries for Python Extension Packages.

Search the page for opencv and for and download the correct .whl for your system. Then pip install it. By example, on my system, after opening a cmd window I typed the following.

pip install opencv_python-3.4.1-cp36-cp36m-win_amd64.whl

I then opened python and the following worked

import cv2
print(cv2.__version__)

More info is available in this Mark Jay video.

:D