If you want something similar to Flask component wise that scales well and allows for nice structuring patterns try Pyramid (https://trypyramid.com/ https://try

If you want something similar to Flask component wise that scales well and allows for nice structuring patterns try Pyramid (https://trypyramid.com/ https://trypyramid.com/). It it is really well thought out framework, you can use it to build single file applications if you want but it really shines when you use Pyramids mechanisms that allow for extending applications and their composition. That being said when you are careful you can probably end up with reasonably structured applications in either Django, Pyramid or Flask. Newly released version of PyPi is built in Pyramid.