couple of reasons: .. This is a Mac only project, therefore it's not a hard requirement to choose a cross platform language. .. Consider how it would be used

couple of reasons: .. This is a Mac only project, therefore it's not a hard requirement to choose a cross platform language. .. Consider how it would be used in production. Two possibilities: a) output as .ai, .jpg, .png to be used as imagery assets. in this case the choice of language makes no difference. b) codes reuse in mac program. in this case, Swift is a better choice b/c it's Apple's choice. This project to me, a programmer, is somewhat connected to the PaintCode App. The idea of using Swift is not a tech argument (e.g. Swift rocks, Python sucks), rather, it's a result of reasoning.