Sierra is a micro templating engine for web frameworks in Python, bridging the gap between Python, HTML and CSS. You can basically do all of your web development solely in Python, taking full advantage of it's powerful functionalities. Functions, variables, loops, conditions - anything really you can do in Python, Sierra makes it easy to integrate with your web application. Plus, the syntax too, is really short and simple for every use case.
Here's the GitHub: https://github.com/BrainStormYourWayIn/sierra
Here's the doc: https://brainstormyourwayin.github.io/sierra.github.io/
Do have a look!