how could I get the instance of a proxy model

for example

class ModelA(models.Model):

     field1 = charfield ()

     field2 = charfield ()

     field3 = charfield ()

def create_itemmodel (sender, instance, created, ** kwargs):

     print "here my class", instance

class ItemModel(ModelA):

     class Meta:

         proxy = True

signals.post_save.connect (create_itemmodel, sender = ItemModel)

but when I save the model only appears: here my class but does not appear instance?

someone help me, because the instance does not print?

Cheers

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