module exports a property instead of a class -- Evil?

[Lonnie Princehouse]

The property factory is nice, but have you considered subclassing
property?

class Mode(property):
  def __init__(self, *vals):
    if [v for v in vals if not isinstance(v,str)]:
      raise ValueError, 'Mode values must be strings'
    else:
      self.values = list(vals)
    property.__init__(self, self.get, self.set)
  def get(self, instance):
     ... 
  def set(self, instance, value):
     ...