[Python] Django - override base class model field on get

I am using Django1.6

i have abstract class A, and class B:

class A(Model):
att = CharField()

class Meta:
abstract = True

class B(A):
pass


i want to override the behaviour of 'att' (without touching class A): so when using:

b = B(att='a').save()
b.att (output is 'a')


but i want to override the output: so:

b.att (output is something else like 'a_thanks')

class B(A):
@propert
def att(self):
return self._att + '_thanks'


how can i do it? i know this is possible from django 1.10

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