Hi Volker,
On 2012-11-02, Volker Braun <vbraun.n...@gmail.com> wrote:
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> Is there any Parent that has generators in Sage?
Yes, all have.
That's to say, sage.structure.parent.Parent provides the infrastructure for
generators.
Just look at the __init__ arguments:
def __init__(self, base=None, *, category=None,
element_constructor=None,
gens=None, names=None, normalize=True, facade=None,
**kwds):
No, they don't have. There is
Parent._populate_generators_
defined in sage.structure.category_object.CategoryObject, which sets
self._generators, but
self._generators doesn't really seem to be used.
> Also, the gens() method is commented out in category_object.pxd. How are
> you supposed to define the generators? Manually implement a gens() method?
I am surprised. If there is a method _populate_generators_ for a class,
there should be a default way to retrieve the generators. But apparently one
currently has to implement one's own gen/gens/ngens method, or inherit
from sage.structure.parent_gens (which is done in sage.structure.rings.Ring,
for example).
Cheers,
Simon
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