code: def import_from_setting(setting_name, fallback):
      
      path = getattr(settings, setting_name, None)
      if path:
          try:
              return import_string(path)
          except ImportError:
              raise ImproperlyConfigured('%s: No such path.' % path)
      else:
          return fallback
docs: Return the resolution of an import path stored in a Django setting.
  
      :arg setting_name: The name of the setting holding the import path
      :arg fallback: An alternate object to use if the setting is empty or
        doesn't exist
  
      Raise ImproperlyConfigured if a path is given that can't be resolved.