I would like to generate compositions in reverse lex order. However, I get:
_______________________________________________________________ sage: C = reversed(Compositions(4)) --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) /home/jyt/monge/TEX/QSCHUR/<ipython console> in <module>() /home/jyt/src/sage-5.4.1/local/lib/python2.7/site-packages/sage/combinat/combinat.py in __len__(self) 972 AttributeError: __len__ has been removed; use .cardinality() instead 973 """ --> 974 raise AttributeError, "__len__ has been removed; use .cardinality() instead" 975 976 def count(self): AttributeError: __len__ has been removed; use .cardinality() instead ___________________________________________________________________________ Of course, I can do ___________________________________________________________________________ sage: C = list(reversed(Compositions(4).list())) sage: C [[4], [3, 1], [2, 2], [2, 1, 1], [1, 3], [1, 2, 1], [1, 1, 2], [1, 1, 1, 1]] ____________________________________________________________________________ but isn't it ugly? I need the outer list to access the items: ____________________________________________________________________________ sage: C = reversed(Compositions(4).list()) sage: C[3] --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /home/jyt/monge/TEX/QSCHUR/<ipython console> in <module>() TypeError: 'listreverseiterator' object has no attribute '__getitem__' _____________________________________________________________________________ with Compositions: _____________________________________________________________________________ sage: c=Compositions(4) sage: c[3] [1, 3] -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To view this discussion on the web visit https://groups.google.com/d/msg/sage-combinat-devel/-/0cLLQFZlpdsJ. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.