docs: def get_config(self):
          """
          Load user configuration or return default when not found.
  
          :rtype: :class:`Configuration`
  
          """
          if not self._config:
              namespace = {}
              if os.path.exists(self.config_path):
                  execfile(self.config_path, namespace)
              self._config = namespace.get('config') or Configuration()
          return self._config