docs: def load(self, cellpy_file, parent_level="CellpyData"):
          """Loads a cellpy file.
  
          Args:
              cellpy_file (path, str): Full path to the cellpy file.
              parent_level (str, optional): Parent level
  
          """
  
          try:
              self.logger.debug("loading cellpy-file (hdf5):")
              self.logger.debug(cellpy_file)
              new_datasets = self._load_hdf5(cellpy_file, parent_level)
              self.logger.debug("cellpy-file loaded")
          except AttributeError:
              new_datasets = []
              self.logger.warning("This cellpy-file version is not supported by"
                                  "current reader (try to update cellpy).")
  
          if new_datasets:
              for dataset in new_datasets:
                  self.datasets.append(dataset)
          else:
              # raise LoadError
              self.logger.warning("Could not load")
              self.logger.warning(str(cellpy_file))
  
          self.number_of_datasets = len(self.datasets)
          self.status_datasets = self._validate_datasets()
          self._invent_a_name(cellpy_file)
          return self