def append(self,value):
if not IAdvert.providedBy(value):
raise ValueError('values must implement IAdvert')
if value.height > height:
raise ValueError('Advert height must be less than the AdSpace (got %s < %s)' % (value.width, width))
if value.width > width:
raise ValueError('Advert width must be less than the AdSpace (got %s < %s)' % (value.width, width))
super(Adverts,self).append(value)
def __setitem__(self,key,value):
if not IAdvert.providedBy(value):
raise ValueError('values must implement IAdvert')
assert value.height < height
assert value.width < width
super(Adverts,self).__setitem__(key,value)
