code: def get_backend_engine(self, name, **kwargs):
          
          if name not in self._engines:
              msg = "Given settings backend is unknowed: {}"
              raise SettingsBackendError(msg.format(name))
  
          return self._engines[name](**kwargs)
docs: Get backend engine from given name.
  
          Args:
              (string): Path to validate.
  
          Raises:
              boussole.exceptions.SettingsBackendError: If given backend name
                  does not match any available engine.
  
          Returns:
              object: Instance of selected backend engine.