code: def set(self, val, default=False, imported=False):
          
          if hasattr(self.validator, '__call__'):
              try:
                  val = self.validator(val)
              except Exception as exc:
                  raise type(exc)(
                      'Could not validate value for "%s" setting: %s' %
                      (self.name, exc)
                  ) from None
          self.value = val
          self.imported = imported
          if default:
              self.default = val
          self.modified = True
docs: Set ``val`` as the :attr:`value` for this :class:`Setting`.
  
          If ``default`` is ``True`` set also the :attr:`default` value.