code: def _update_known_atts(self, **kwargs):
          
          for k, v in kwargs.items():
              if k not in ATTR_KEYS:
                  # Warn if passed in unknown kwargs
                  raise SyntaxWarning('Unknown argument: {}'.format(k))
              elif not v: # Delete attributes with falsey values
                  delattr(self, k)
              else:
                  setattr(self, k, v)
docs: Updates instance attributes with supplied keyword arguments.