text: class OptionalAttribute(Attribute,_Attribute):
   """
   Indicates that a parameter is optional.
  
   
  
   OptionalAttribute()
   """
   def __init__(self,*args):
    """ x.__init__(...) initializes x; see x.__class__.__doc__ for signaturex.__init__(...) initializes x; see x.__class__.__doc__ for signaturex.__init__(...) initializes x; see x.__class__.__doc__ for signature """
    pass
  