def __init__(self, predicate):
        """Create a new Filter with the specified Expression as a predicate."""
        super(Filter, self).__init__(predicate)
        self.predicate = predicate
        self.validate()
def __init__ ( self , predicate ) : super ( Filter , self ) . __init__ ( predicate ) self . predicate = predicate self . validate ( )
Create a new Filter with the specified Expression as a predicate.