On Tue, Jan 22, 2013 at 04:33:33AM -0800, Nathann Cohen wrote:
> > Well, for a start you cannot ask Sage to reverse the iteration order of
> > anything that you can iterate on.
> >
> > First example : reversed(NN)
>
OK, but there is some inconsistent behavior, anyway:
sage: P=Partitions(4)
sage: len(P)
5
sage: C=Compositions(4)
sage: len(C)
---------------------------------------------------------------------------
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
sage: R=reversed(P)
sage: list(R)
[[1, 1, 1, 1], [2, 1, 1], [2, 2], [3, 1], [4]]
>
>
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