The first one:

*db(*(db.asset.tipo=='SC') & (db.asset.is_active==True)*)*

Returns a Set (this is not a python set but a pyDAL one)

The second one:

(db.asset.tipo=='SC') & (db.asset.is_active==True)

Actually returns a Query

A set is what you get when you call your DAL instance with a query as 
argument.

The Grid is actually expecting a query because it can do more than one call 
to the DAL with that same query to get different things.

See:
https://github.com/web2py/pydal/blob/master/pydal/objects.py


-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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