is it possible to build database queries from smaller pieces

I had something in mind like

    filter = []
    for key,value in session.filter.iteritems():
        if key.startswith('os') and value:
            os = key.split()[1]
            filter.append( (db.software.os == os) )
    ...
    return UL([LI(s.name) for s in
db(db.software.id>0)&filter.select()])

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