In your operating system you must have Python and virtualenvwrapper installed. If you have Ubuntu you can:
$ sudo apt-get install python python-dev virtualenvwrapper
After that you create a virtualenv and you can install the necessary packages for the project(without sudo!):
$ mkvirtualenv osss-web $ pip install flask flask-sqlalchemy
If you open a new shell session, don't forget to activate the virtualenv:
$ workon osss-web
To start the server, run the python script:
$ python magazin.py