$ sage
| Sage Version 4.7, Release Date: 2011-05-23 |
| Type notebook() for the GUI, and license() for information. |
sage: P = polytopes.cross_polytope(3) sage: P.vertices() [[0, 0, 1], [0, 1, 0], [1, 0, 0], [0, 0, -1], [0, -1, 0], [-1, 0, 0]]
sage: P.faces(3)
AttributeError Traceback (most recent call last)
/home/barry/<ipython console=""> in <module>()
AttributeError: 'Polyhedron' object has no attribute 'faces'