I just started web development, but I have an app that uses firebase database, so I was wondering if I'd be able to create a website written in python that could use firebase hosting and database? If not what language would I have to use?
Beyond serving static content, you can use Cloud Functions for Firebase or Cloud Run to serve dynamic content and host microservices on your sites.
JavaScript code can access Firebase databases via the web API from an app or via Cloud Functions.
A Python web server could be set up, for example, running on Google App Engine or Azure, that uses the Firebase Admin SDK, which has a Python API for Firebase databases.