How do I save data on a webpage for later use?

I've just written the code for an ELO matchmaking system that ranks baseball players in Python (based on public votes). I want to turn it into a website so that other people can use it and contribute to it. I don't know anything about web design, but I imagine my main hurdles would be to code it up in Java or HTML, and then find a way to save list data within the web page so that when people change the ELO rating of players, those changes are saved for subsequent use. How do I achieve this?