============================ Klein, a Web Micro-Framework

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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 to Bottle <https://bottlepy.org/docs/dev/index.html>_ and Flask <https://flask.palletsprojects.com/>. 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 like Werkzeug <https://werkzeug.palletsprojects.com/> and Twisted <https://twisted.org>_.

A Klein bottle <https://en.wikipedia.org/wiki/Klein_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 at Read The Docs <https://klein.readthedocs.org>_.

Example

This is a sample Klein application that returns ‘Hello, world!’, running on port 8080.

.. code-block:: python

from klein import run, route

@route('/')
def home(request):
    return 'Hello, world!'

run("localhost", 8080)

Contribute

klein is hosted on GitHub <https://github.com/twisted/klein>_ and is an open source project that welcomes contributions of all kinds from the community, including:

• code patches,
• documentation <https://klein.readthedocs.org/>_ improvements,
• bug reports <https://github.com/twisted/klein/issues>_,
• reviews for contributed patches <https://github.com/twisted/klein/pulls>_.

For more information about contributing, see the contributor guidelines <https://github.com/twisted/klein/tree/trunk/CONTRIBUTING.rst>_.