Hi Bruce,
On Sat, May 17, 2014 at 12:29:54PM -0700, Bruce wrote:
> I changed this to
>
> class Foo(Element):
> def __init__(self, a):
> self.data = a
> Element.__init__(self, Foos)
>
> which seems a bit simpler as we still have Foo(1) without an extra
> argument.
Notes:
- this should be `Foos()`, rather than Foos
- elements are more often than not constructed from their parent as:
sage: F = Foos()
sage: F(data)
In this situation, both the parent and the data is passed to the
constructor of the element class.
- In case your data structure consists of a single value, you can use
ElementWrapper which does exactly the above __init__ for you
together with some other goodies. For an example, see
sage: S = Semigroups().example()
sage: S??
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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