code: def get_app_name(mod_name):
      
      rparts = list(reversed(mod_name.split('.')))
      try:
          try:
              return rparts[rparts.index(MODELS_MODULE_NAME) + 1]
          except ValueError:
              # MODELS_MODULE_NAME ('models' string) is not found
              return rparts[1]
      except IndexError:
          # Some weird model naming scheme like in Sentry.
          return mod_name
docs: Retrieve application name from models.py module path
  
      >>> get_app_name('testapp.models.foo')
      'testapp'
  
      'testapp' instead of 'some.testapp' for compatibility:
      >>> get_app_name('some.testapp.models.foo')
      'testapp'
      >>> get_app_name('some.models.testapp.models.foo')
      'testapp'
      >>> get_app_name('testapp.foo')
      'testapp'
      >>> get_app_name('some.testapp.foo')
      'testapp'