It bothers me that people still treat python as a quick script hacking tool. You can build magnificent software with python.
IMHO for greenfield startup projects/POCs, I much prefer python for making things fast and getting things out to market asap. Spaghetti gets me fed.
This is good for python. It does break down for bigger more complex projects at a certain point.
This is a Django based tool to manage the tax rates you pay on any thing you might trade with the UK.
It can handle all the changes to the tax from the founding of the EU, through past Brexit when the UK has its own tariff as well.
Running it locally, it may not be straightforward to get hold of the right data (you can download it, but I don't think it's a turn key thing).