#5308: Removing __len__ for combinatorial classes
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Reporter: hivert | Owner: hivert
Type: enhancement | Status: new
Priority: major | Milestone: sage-combinat
Component: combinatorics | Keywords: __len__, count, combinatorial class
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After some discussion on sage-combinat-devel, it was decided that __len__
should no be used to get the size of a combinatorial class because. Indeed
the specifications of __len__ says that it has to return a plain python
int, whereas we want to deal with huge and even infinite sets.
Unfortunately due to __len__ being called by list / filter / map and maybe
some other functions, it is not possible to issue a warning. So it was
decided to simply remove it and issue an error, telling to call .count()
instead.
Some part of combinat has to be fixed accordingly.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5308>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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