(self, other)
Subclasses should implement this method and should return
            True if other is on the boundaries of self;
            False if not on the boundaries of self;
            None if a determination cannot be made.
Subclasses should implement this method and should return
            True if other is on the boundaries of self;
            False if not on the boundaries of self;
            None if a determination cannot be made.
Subclasses should implement this method and should return True if other is on the boundaries of self ; False if not on the boundaries of self ; None if a determination cannot be made .
def contains(self, other):
        """Subclasses should implement this method and should return
            True if other is on the boundaries of self;
            False if not on the boundaries of self;
            None if a determination cannot be made."""
        raise NotImplementedError()
def contains ( self , other ) : raise NotImplementedError ( )