I don't think there is any deep reason. Sage started much before the
existence of the numbers Python module.

Note that the concept of "Number" is not clearly stated in the library.
Does it include finite fields? padics? polynomials (these can be seen
as infinitesimal deformation of scalars)?

Vincent

Le 15/07/2021 à 12:38, '[email protected]' via sage-devel a écrit :
Hi, I was looking into typing a bit and realized that our number field
elements are not registered as numbers. So the following will not evaluate
to true:

sage: import numbers
sage: K.<a> = QuadraticField(2)
sage: isinstance(a, numbers.Number)

Is there a reason, we do not register number fields in
`rings/numbers_abc.py`? Can I just change this?

E.g. I want to specify an iterable over numbers via
`Iterable[numbers.Number]`, which would not include our number field
elements currently.

Jonathan


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