>
> query=(db.auth_membership.user_id==db.auth_user.id
> )(db.courses.teacher_id==db.auth_user.id)(db.auth_membership.group_id==
> db.auth_group.id)(db.auth_group.role=='teacher')
>

The above is not valid syntax. A Set object is callable, and when called, 
it returns another Set object, so you can chain Sets:

myset = db(query1)(query2)(query3)

If you instead want to work with Query objects, you have to make explicit 
conjunctions using the "&" operator:

myquery = query1 & query2 & query3

Anthony

-- 
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