webargs

A friendly library for parsing HTTP request arguments, with built-in support for popular web frameworks, including Flask, Django, Bottle, Tornado, Pyramid, webapp2, Falcon, and aiohttp. Maintained by marshmallow-code on GitHub, where it has earned 1,407 stars from the community.

It's actively developed around aiohttp, bottlepy, django, and is a solid reference for anyone building with these tools.