[python] python3.6 and venv python3.6 install

generally python3.5 venv install based on ubuntu 16.04 LTS

sudo apt install python3-venv
python3 -m venv pyvenv
sourece venv/bin/activate

python3.6 venv install based on ubuntu 16.04 LTS

install python3.6

sudo add-apt-repository ppa:jonathonf/python-3.6
sudo apt-get update
sudo apt-get install python3.6
python3.6 -V

install venv python3.6

sudo apt install python3.6-venv
python3.6 -m venv pyvenv
sourece venv/bin/activate