code: def _validate_path(self, settings, name, value):
          
          if not os.path.exists(value):
              raise SettingsInvalidError("Path from setting '{name}' does not "
                                         "exists: {value}".format(
                                             name=name,
                                             value=value
                                         ))
  
          return value
docs: Validate path exists
  
          Args:
              settings (dict): Current settings.
              name (str): Setting name.
              value (str): Path to validate.
  
          Raises:
              boussole.exceptions.SettingsInvalidError: If path does not exists.
  
          Returns:
              str: Validated path.