use a list of points as sphere center in Python

Hi all,

I'm tryin to do a simple exercise where once I have a list of points "a" I want to feed the rs.addSphere with it as centers.

The thing is that it says that it can't convert [] to planes (or points I assume)

with addPolyline or addInterpCurve it do works, thou

But if I pull "sph= rs.addSpehere (a, rd)" to a separate script using the outputted "a" list as input it does recognize it

so i'm a bit confused (obviously because I'm a plain begginer)

Should I use Rhino common to identify the data in "a" as geometry.poin? if so...how can I do it, i've tried but no results (lack of knowledge anyways)

Thanks in advance