This program allows you to fetch all cars from otomoto.pl

python -m venv venv
. venv/bin/activate
pip install -r requirements.txt

scrapy crawl -L WARNING otomoto -o otomoto.json

This will generate otomoto.json file with all cars that are currently available. You can further investigate them or create some analysis.

For some interesting applications check out this: http:https://prokulski.net/index.php/2018/01/23/sprzedam-opla/

This suppose to be analysis repository for buying used car, but I found one quickly, so... Maybe some day.