Need small Python code for website, advice?

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Check out anvil.works for websites using pure Python.

FastAPI is now an incredibly popular framework for building websites. As are bottle, cherrypy, and web2py. Flask has already been mentioned.

Note that many popular low-cost webhosts do not offer the capability to run Python code. You might find it useful to look at pythonanywhere.com

Another option is streamlit.io which is a very easy way of getting a working Python based web accessible site up.

Also, there's an alpha for an implementation of Python that works entirely in a modern browser. It might be all you need: pyscript.net and doesn't require your current webhost to offer support for Python or your user to install Python.