code: def use_plugin_preset(self, preset):
          
          if isinstance(preset, str):
              try:
                  preset = self._presets[preset]
              except (AttributeError, KeyError):
                  raise AngrNoPluginError("There is no preset named %s" % preset)
  
          elif not isinstance(preset, PluginPreset):
              raise ValueError("Argument must be an instance of PluginPreset: %s" % preset)
  
          if self._active_preset:
              l.warning("Overriding active preset %s with %s", self._active_preset, preset)
              self.discard_plugin_preset()
  
          preset.activate(self)
          self._active_preset = preset
docs: Apply a preset to the hub. If there was a previously active preset, discard it.
  
          Preset can be either the string name of a preset or a PluginPreset instance.