Use a name that exists in both python2 and 3,
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@ -31,7 +31,7 @@ class MyAutoField(six.with_metaclass(models.SubfieldBase, models.CharField)):
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def pre_save(self, instance, add):
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value = getattr(instance, self.attname, None)
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if not value:
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value = MyWrapper(''.join(random.sample(string.lowercase, 10)))
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value = MyWrapper(''.join(random.sample(string.ascii_lowercase, 10)))
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setattr(instance, self.attname, value)
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return value
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