All this book was tested using Debian and PostgreSQL. Here is how to install all system dependencies on a Debian like operating system:
sudo apt-get install postgresql libpq-dev sudo apt-get install python3-dev python3-venv sudo apt-get install git libffi-dev libssl-dev libxml2-dev libxslt1-dev libyaml-dev zlib1g-dev
Once your operating system and database engine are ready, it's time to create a Postgresql role for the project (Replace 'myusername') that matches your host user, at least you should be able to createdb/dropdb without errors:
createdb testws dropdb testws
If you get some errors create a Postgresql role (it's up to you, you can set yourself as superuser at the same time):
sudo -u postgres createuser --createdb --superuser myusername
We advice to use a python virtual environment. One of its main features is to make you able to develop different projects with different versions of libraries. This avoid conflict when 2 applications are depending on different versions of the same library.
Here is how to create the virtualenv and activate it.
python3 -m venv rooms-venv source rooms-venv/bin/activate
Once activated, all python commands (like
pip and so on) are launched in
In all book examples, we assume you have activated your virtual environment. Make sure it is activated by looking at the left part of your terminal, its name is generally displayed.