Jinja2 is pretty slick. You can use it with template files or strings; you can use it to create formatted text, such as HTML, XML, Markdown, and e-mail content; you can put together templates, reuse templates, and extend templates; you can even use extensions with it. The possibilities are countless, and combined with nice debugging features, auto-escaping, and full unicode support.
Note
Auto-escaping is a Jinja2 configuration where everything you print in a template is interpreted as plain text, if not explicitly requested otherwise. Imagine a variable x has its value set to <b>b</b>. If auto-escaping is enabled, {{ x }} in a template would print the string as given. If auto-escaping is off, which is the Jinja2 default (Flask's default is on), the resulting text would be b.
Let's understand a few concepts before covering how Jinja2 allows us to do our coding.
First, we have the previously mentioned curly braces. Double curly braces are a delimiter that...