First Install VirtualEnv and setup a Virtual Environment and activate it.
$ sudo pip install virtualenv
$ virtualenv ENV-NAME
$ source ENV-NAME/bin/activateOpenCv Installation
$ sudo pip3 install opencv-python
$ sudo pip3 install opencv-contrib-python
$ sudo apt-get update
$ sudo apt-get install libhdf5-serial-dev
$ sudo apt-get update
$ sudo apt-get install libatlas-base-dev libjasper-dev libqtgui4 libqt4-testTo use OpenCv
$ import cv2
To get out of the Environment
$ deactivate