code: def register_presets(self, presets, replace=False):
          
          if replace:
              self.presets = {}
          self.presets.update(presets)
docs: Add new presets to this policy object.
  
              Merges the presets dictionary ``presets`` into this ``Policy``
              object, or replaces the current presets if ``replace`` is
              ``True``.
  
              ``presets`` should be a dictionary mapping ``str`` preset names
              to ``<class PresetDefaults>`` objects specifying the command
              line defaults.
  
              :param presets: dictionary of presets to add or replace
              :param replace: replace presets rather than merge new presets.