On Saturday, 7 June 2014 00:13:50 UTC+10, Dinakar Muthiah wrote:
>
> Ideally, I would like to define a subclass of Partition called MyPartition
> and include all my custom methods. I think this is a standard way to extend
> libraries, but for some reason this doesn't work at all. Is there a
> solution that is more in the spirit of subclassing?
On Saturday, 7 June 2014 00:13:50 UTC+10, Dinakar Muthiah wrote:
>
> Ideally, I would like to define a subclass of Partition called MyPartition
> and include all my custom methods. I think this is a standard way to extend
> libraries, but for some reason this doesn't work at all. Is there a
> solution that is more in the spirit of subclassing?
The problem is that a partition in sage is not an isolated object, rather,
it is the element class of Partitions. If you want to subclass Partition
then you also need to create a parent. Also, as Nils says below you are
likely to run into problems because any (most?) method(s) of MyPartition
that returns a partition will return a Partition rather than a MyPartition.
This said, if you really want to do this then you need something like the
following:
from sage.structure.element import Element
from sage.structure.global_options import GlobalOptions
from sage.combinat.partition import PartitionOptions
class MyPartition(Partition):
@staticmethod
def __classcall_private__(cls, mu=None, **keyword):
return MyPartitions()(super(MyPartition,cls).__classcall_private__(
cls,mu,**keyword))
def fred(self):
return "fred"
class MyPartitions(Partitions):
Element=MyPartition
global_options=PartitionOptions
Quite likely there will be more tweaks to get this to work fully, but it
certainly gets things going:
%attach mypartiiton.py
sage: MyPartition([3,2])
[3, 2]
sage: mu=MyPartition([3,2]).cells()
sage: mu=MyPartition([3,2]).fred()
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