There are different template engines for SSR, with drastically different syntax. I've never written any Python, but in my own opinion, Smarty for PHP and Twig-c

There are different template engines for SSR, with drastically different syntax. I've never written any Python, but in my own opinion, Smarty for PHP and Twig-compatible ones for many different languages are the best. While generating any moderately complex HTML on the front end is a pain in the ass for me. I prefer avoiding it. If I need to request some data from the server to dynamically update the page with, I just make that endpoint return some server-side-rendered HTML that I insert wherever it needs to go.