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for i in Rental.objects.filter(inventory__film_id=2).order_by("inventory_id"):
amnt=Payment.objects.filter(rental_id= int(i.rental_id))
print ("Rental of %s is %s") %(i, amnt[0].amount)
Since an object of payment is returned to you, you have to mention which field you are going to display.
Source:stackexchange.com