code: def set_data(self, *keys, value):
          
          _datadict = self.data
          for ii, _key in enumerate(keys):
              if ii==len(keys)-1:
                  _datadict[_key] = value
              else:
                  if _key not in _datadict:
                      _datadict[_key] = {}
                  _datadict = _datadict[_key]
          return True
docs: Set a value in the instance `data` dict.
  
          :param keys: the `data` dict keys referencing the value in the `data` dict.
          :type keys: str 
          :param value: the value to be set in the `data` dict. Note that
              `value` is a keyword-only argument.
          :returns: `True` if successful.