Options.app_label  
If a model is defined outside of an application in INSTALLED_APPS, it must declare which app it belongs to:
app_label = 'myapp'
 New in Django 1.9. 
If you want to represent a model with the format app_label.object_name or app_label.model_name you can use model._meta.label or model._meta.label_lower respectively.
 
          
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