#10320: __len__ still used in polyhedra.py
------------------------+---------------------------------------------------
Reporter: jplabbe | Owner: mhampton
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.1
Component: geometry | Keywords: polyhedron, len
Author: JP Labbé | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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When you create the 3-dimensional permutahedron by hand (because one could
use polytopes.permutahedron(4) instead), this yields an AttributeError.
The __init__ function of Polyhedron uses the function len(x), but it has
been removed.
{{{
sage: P=Polyhedron(Permutations([1,2,3,4]))
----------------------------------
AttributeError Traceback (most recent call last)
sage-4.6/<ipython console> in <module>()
sage-4.6/local/lib/python2.6/site-packages/sage/geometry
/polyhedra.pyc in __init__(self, vertices, rays, lines, ieqs, eqns,
field, compute_adjacency, verbose)
1507
1508 # Clean up the arguments
-> 1509 vertices = _set_to_None_if_empty(vertices)
1510 rays = _set_to_None_if_empty(rays)
1511 lines = _set_to_None_if_empty(lines)
sage-4.6/local/lib/python2.6/site-packages/sage/geometry
/polyhedra.pyc in _set_to_None_if_empty(x)
184 """
185 if x==None: return x
--> 186 if len(x)==0: return None
187 return x
188
sage-4.6/local/lib/python2.6/site-packages/sage/combinat
/combinat.pyc in __len__(self)
888 AttributeError: __len__ has been removed; use
.cardinality() instead
889 """
--> 890 raise AttributeError, "__len__ has been removed; use
.cardinality() instead"
891
892 def count(self):
AttributeError: __len__ has been removed; use .cardinality() instead
sage:
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10320>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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