def __init__(self, function, empty_callback=lambda:None):
ComputedCell.__init__(self, function)
# Called when there are no more dependants:
self.empty_callback = empty_callback
def __init__(self, function, empty_callback=lambda: None):
ComputedCell.__init__(self, function)
# Called when there are no more dependants:
self.empty_callback = empty_callback
