def __iand__ ( self , other ) : self . known &= other . known self . active &= other . active return self
set python opposite of intersection
Intersect this flag with other in - place .
def __iand__(self, other):
        """Intersect this flag with ``other`` in-place.
        """
        self.known &= other.known
        self.active &= other.active
        return self