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The Twisted team doesn't have a ton of interest in the user-facing bits of our "microframework", Klein, which is a sort of Flask-alike for Twisted. Flask with Twisted characteristics, if you will.
There isn't a ton of interest from outside the community either, as the framework is a bit of an incomplete shell, having *parts* of form-handling and session-management but requiring you to build the other parts yourself from a barely-documented construction kit.