A pure Python implementation of the Cassowary constraint-solving algorithm. Cassowary is the algorithm that forms the core of the OS X and iOS visual layout mechanism.
Cassowary is compatible with both Python 2 or Python 3. To install Cassowary in your virtualenv, run:
$ pip install cassowary
Then, in your Python code, you can create and solve constraint systems. See the documentation for examples of what this looks like in practice.
Documentation for Cassowary can be found on Read The Docs.
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If you experience problems with Cassowary, log them on GitHub. If you want to contribute code, please fork the code and submit a pull request.