How to retrieve the app name from within my model declaration

In my application pos, I have the following model::

class Receipt(Model):
    class Meta:    
        db_table = 'pos_receipt' 

I want to rename the table as pos_receipt_gh开发者_开发知识库ost and I don't want to hardcode the app name. I want to do this:

class Receipt(Model):
    class Meta:    
        db_table = '%s_receipt_ghost` % get_app_name()

Does something like get_app_name exists ?

Name of the app is available in Meta.app_label

class Receipt(Model):
    class Meta:
        pass
Receipt._meta.db_table = '%s_receipt_ghost' % Receipt._meta.app_label

Or

class Receipt(Model):
    class Meta:
        db_table = '%s_receipt_ghost'                
Receipt._meta.db_table %= Receipt._meta.app_label