So in my scripts I should use Model.osv when defining a new model? class my_object(osv.osv):

should be:

class my_object(Model.osv):

Yes @patrick. You should use osv.Model instead of osv.osv and osv.TransientModel instead of osv.osv_memory.

In fact the recommended solution is from openerp.osv import orm, fields,... then do class X(orm.Model): class Y(orm.TransientModel):

Yes. Instead of from osv or from toole, etc, we should use from openerp.osv or from openerp.tools, etc.