Anders Hammarquist - Metaclasses for fun and profit: Making a declarative GUI implementation When overhauling the user interface of Autolabel's labeling printers, we wanted a clean way to describe the layout of the settings widgets. The structure we came up with was a declarative class layout that leverages Python's metaclass concept to build the underlying GTK widget structure. I will present the implementation to hopefully inspire you to apply metaclass techniques to problems that standard Python syntax can't quite solve. If that fails, you will at least have a way to declaratively construct GTK GUIs. A short, non-exaustive, summary of concepts I will mention includes metaclasses (obviously), class hierarchies, method resolution order, super(), and anecdotes of dealing with GTK.