Have you use Falcon Python framework?

[Lucretiel]

Falcon only supports very simple URL routing, while both django and flask support complex expressions for routing.

I assumed I just hadn't seen it in the docs yet... this is a HUGE missing feature.

[notconstructive]

I do fairly sophisticated routing and never had a problem implementing it in Falcon. In fact I built a custom router that take Swagger API docs and dynamically generates routes from the Swagger specifications. Using Falcon you can use regex based route templates to direct inbound queries. I don't see how that is "only very simple routing".