This is an efficient C++ implementation of the Cassowary constraint solving algorithm. Kiwi(solver) is an implementation of the algorithm based on the seminal Cassowary paper. It is not a refactoring of the original C++ solver. Kiwi(solver) has been designed from the ground up to be lightweight and fast. It ranges from 10x to 500x faster than the original Cassowary solver with typical use cases gaining a 40x improvement. Memory savings are consistently > 5x. This is the Python 3 version of kiwisolver and will coexist with SBo's python2-kiwisolver package. python3-kiwisolver 1.4.1 is the last possible version for Slackware 15.0. Newer versions would require a newer python-setuptools.