$ nix-shell
# then jump to Usage within the nix shell
$ python3 -m venv .venv
$ . .venv/bin/activate
(venv)$ pip3 install -r requirements.txt
$ ./main.py url login path
The url is the complete URL of the subject http://....html
The login is your full login
The path given is a relative path from where you launch the script to the directory where all the files will be created