I just finished creating an Outlook apps addin template for python!
Its basically a modified version of the office addin taskpane JS repository from here: https://github.com/OfficeDev/Office-Addin-TaskPane-JS combined with a modified version of the azure webapp sample from here: https://github.com/Azure-Samples/python-docs-hello-world
Why is this good? - This allows you to use Python as the backend for your Outlook addin instead of using node.js. So you can use flask, and any other python modules with your outlook addin. Microsoft ONLY has examples from asp.net or node.js for there office addin samples, so I am hoping this will help others who want to make an addin for outlook or office in general but with using something like python.