Install OpenCV for Python3 on Debian (not tested)

install_opencv_python3.sh

# !/bin/bash -ex

OPENCV=3.3.0
OPENCV_CONTRIB=3.3.0

# Install Pre-requisites
sudo apt-get -y update
sudo apt-get -y upgrade
sudo apt-get -y install build-essential cmake git pkg-config wget \
                        libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev \
                        libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
                        libatlas-base-dev gfortran python3.5-dev unzip

# Install Pip3
wget https://bootstrap.pypa.io/get-pip.py
sudo python3 get-pip.py

# Install NumPy
pip3 install numpy

# Install OpenCV
cd ~
wget https://github.com/opencv/opencv/archive/${OPENCV}.zip
unzip opencv-${OPENCV}.zip
wget https://github.com/opencv/opencv_contrib/archive/${OPENCV_CONTRIB}.zip
unzip opencv_contrib-${OPENCV_CONTRIB}.zip
cd ~/opencv-${OPENCV}
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
	    -D CMAKE_INSTALL_PREFIX=/usr/local \
	    -D INSTALL_C_EXAMPLES=OFF \
	    -D INSTALL_PYTHON_EXAMPLES=ON \
	    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-${OPENCV_CONTRIB}/modules \
	    -D BUILD_EXAMPLES=ON
make
sudo make install
sudo ldconfig