Flask includes the Jinja2 template engine to programmatically generate HTML output from data. You use the render_template function to generate HTML, then pass in variables to be used in the template.

For example, if the JSON-LD markup describes a performer, the HTML body should describe that same performer.” We can simply adapt our jinja2 template so it outputs HTML.

Python 3.14 has a new feature called the template string, or t-string, type. A t-string superficially resembles an f-string, but it’s designed to do something very different.