code: def _performAction(self, action):
          
          try:
              _a11y.AXUIElement._performAction(self, 'AX%s' % action)
          except _a11y.ErrorUnsupported as e:
              sierra_ver = '10.12'
              if mac_ver()[0] < sierra_ver:
                  raise e
              else:
                  pass
docs: Perform the specified action.