For convenience you should use virtualenvwrapper:

sudo pip install virtualenvwrapper

Add three lines to /etc/environment or another shell startup file:

export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/python_dev
source /usr/share/virtualenvwrapper/virtualenvwrapper.sh

Create a new virtual environment:

mkvirtualenv confluence_dumper_venv

Enter the virtual environment:

workon confluence_dumper_venv

Install dependencies:

pip install -r requirements.txt

Copy confluence settings:

cd confluence_dumper
cp settings.sample.py settings.py

Please personalize the settings.py on your own according to your confluence instance.

Don't forget to switch to the virtual environment because of the installed dependencies:

workon confluence_dumper_venv

Run confluence dumper:

cd confluence_dumper
python confluence_dumper.py