Simple example code, using Ubuntu + Python + PostgreSQL.
OS: ubuntu-trusty64 ~ https://vagrantcloud.com/ubuntu/boxes/trusty64
Python: v2.7.6 ~ no pip/wheel by default
Pip: v1.5.4 ~ sudo apt-get install python-pip
wheel: v0.24.0 ~ installed by default with python-pip/wheel
twisted: v13.2.0 ~ sudo apt-get install python-twisted
PostgreSQL: v9.4 ~ use postgres install from postgres site http://www.postgresql.org/download/linux/ubuntu/
sudo deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main
sudo wget https://www.postgresql.org/media/keys/ACCC4CF8.asc
sudo apt-key add
sudo apt-get update
apt-get install postgresql-9.4