none! The semantic HTML and template logic are both in python and thus look too similar in all of them. You want the HTML in the template to look like HTML and

none! The semantic HTML and template logic are both in python and thus look too similar in all of them. You want the HTML in the template to look like HTML and visually distinct from the template logic so you or other designers working on the project can style these semantic structures easily with stylesheets. Writing HTML with an IDE like eclipse that autotypes the closing of an element and autovalidates if elements are closed is easy enough, and there's no string-joining nonsense.