@staticmethod
    def get_lastaccess(category, key, default=None):
        try:
            return Cache._objects[category][key]['lastaccess']
        except Exception:
            return default
Set the global viewer.  Handy if you need to use visual from your
dataset/ETHPy150Open kivy/kivy/kivy/cache.py/Cache.get_lastaccess--crossover with--dataset/ETHPy150Open enthought/mayavi/tvtk/tools/visual.py/set_viewer