Model field choices

I have a model which has choices specified for the "offer_type" field:

class Coupon(models.Model):
offer_types = (
(1, 'Percentage Off'),
(2, 'Amount Off'),
(3, 'Free'),
)

business = models.ForeignKey(Business)
offer_type = models.IntegerField(choices=offer_types)

How do I then retrieve the "human readable" values when referencing a
Coupon object? Right now Coupon.objects.get(id=1).offer_type returns
the numeric value only ("3" instead of "free"... which I suppose is to
be expected).

Thanks!

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