Specify the specific position of a boundary.

• position - The position of the boundary. o extension - An optional argument which must be zero since we don't have an extension. The argument is provided so that the same number of arguments can be passed to all position types.

In this case, there is no fuzziness associated with the position.

__init__ (
        self,
        position,
        extension=0,
        )

__str__ ( self )