Full python 2.7 and 3.6 support. A nice GUI editor. All system features that Apple allows to be accessed, can be accessed. And you can even save your "apps" to the homescreen and launch them from there. Short of seeing the Pythonista launch scree n for as the app launches, you would never know it wasn't it's own app.
This isn't a new app either, it's been around for years.