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Klein is a micro-framework for developing production-ready web services with Python.It is 'micro' in that it has an incredibly small API similar toBottle andFlask.It is not 'micro' in that it depends on things outside the standard library.This is primarily because it is built on widely used and well tested components likeWerkzeug andTwisted.

AKlein bottle is an example of a non-orientable surface, and a glass Klein bottle looks like a twisted bottle or twisted flask.This, of course, made it too good of a pun to pass up.

Klein's documentation can be found atRead The Docs.

This is a sample Klein application that returns 'Hello, world!', running on port8080.

fromkleinimportrun,route@route('/')defhome(request):return'Hello, world!'run("localhost",8080)

klein is hosted onGitHub and is an open source project that welcomes contributions of all kinds from the community, including:

• code patches,
• documentation improvements,
• bug reports,
• reviews forcontributed patches.

For more information about contributing, seethe contributor guidelines.