def update_seen_at(self):
        self.seen_at = datetime.datetime.utcnow()
Property setter for position.
dataset/ETHPy150Open tschellenbach/Stream-Framework/stream_framework/activity.py/AggregatedActivity.update_seen_at--crossover with--dataset/ETHPy150Open enthought/pyface/pyface/ui/null/window.py/Window._set_position