thank you so much for the pointer, massimo. anthony already point the url 
above.
e.g.
import random

def index():
    limitby = (0, 5)
    rows_random = db((db.product.quantity > 0) ).select(limitby = 
limitby).sort(lambda row: random.random() )
    return dict(rows_random = rows_random)

thanks and best regards,
stifan

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