conda env create -f environment.yml

source activate f2b

conda deactivate

conda info --envs

conda remove --name f2b --all

pip install opencv-python==3.4.2.17
pip install opencv-contrib-python==3.4.2.17

import sys
print(sys.path)
sys.path.remove('/opt/ros/kinetic/lib/python2.7/dist-packages')