code: def save(self, conflict_resolver=choose_mine):
  
          '''Save all options in memory to the `config_file`.
  
          Options are read once more from the file (to allow other writers to save configuration),
          keys in conflict are resolved, and the final results are written back to the file.
  
          :param conflict_resolver: a simple lambda or function to choose when an option key is
                 provided from an outside source (THEIRS, usually a file on disk) but is also already
                 set on this ConfigStruct (MINE)
          '''
          config = self._load(conflict_resolver)  # in case some other process has added items
          with open(self._config_file, 'wb') as cf:
              config.write(cff save(self, conflict_resolver=choose_mine):
  
          '''Save all options in memory to the `config_file`.
  
          Options are read once more from the file (to allow other writers to save configuration),
          keys in conflict are resolved, and the final results are written back to the file.
  
          :param conflict_resolver: a simple lambda or function to choose when an option key is
                 provided from an outside source (THEIRS, usually a file on disk) but is also already
                 set on this ConfigStruct (MINE)
          '''
          config = self._load(conflict_resolver)  # in case some other process has added items
          with open(self._config_file, 'wb') as cf:
              config.write(cf)
docs: Save all options in memory to the `config_file`.
  
          Options are read once more from the file (to allow other writers to save configuration),
          keys in conflict are resolved, and the final results are written back to the file.
  
          :param conflict_resolver: a simple lambda or function to choose when an option key is
                 provided from an outside source (THEIRS, usually a file on disk) but is also already
                 set on this ConfigStruct (MINE)