code: def get_spam_checker(backend_path):
      
      try:
          backend_module = import_module(backend_path)
          backend = getattr(backend_module, 'backend')
      except (ImportError, AttributeError):
          warnings.warn('%s backend cannot be imported' % backend_path,
                        RuntimeWarning)
          backend = None
      except ImproperlyConfigured as e:
          warnings.warn(str(e), RuntimeWarning)
          backend = None
  
      return backend
docs: Return the selected spam checker backend.