One insight we gained after talking with our teams is that Python is making a comeback across many technology domains. In fact, it's well on its way to become the most-used programming language. In part, this is driven by its adoption by data scientists and in machine learning, but we also see teams adopting it to build microservices. Nameko is a super-lightweight microservices framework and an alternative to Flask for writing services. Unlike Flask, Nameko only has a limited set of features that includes WebSocket, HTTP and AMQP support. We also like its focus on testability. If you don't need features such as templating that Flask provides, then Nameko is worth a look.