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I felt this way when I first saw better_errors: https://github.com/charliesome/better_errors

It's a little surprising how much we keep reinventing.

Stuff like that has been in Python for a long time. (Werkzeug)

That sounds like a clone of Rack, that doesn't support the latest version of Python.

Few that aren't running a charity use Python 3 in production web apps.

Rack <-> WSGI

Werkzeug is just an app server on top of WSGI that happens to be very nice, with features like the above described.