docs: def savenetcdf(dataarray, filename=None):
      """Save a dataarray to a NetCDF file.
  
      Args:
          dataarray (xarray.DataArray): Dataarray to be saved.
          filename (str): Filename (used as <filename>.nc).
              If not spacified, random 8-character name will be used.
      """
      if filename is None:
          if dataarray.name is not None:
              filename = dataarray.name
          else:
              filename = uuid4().hex[:8]
      else:
          filename = str(Path(filename).expanduser())
  
      if not filename.endswith('.nc'):
          filename += '.nc'
  
      dataarray.to_netcdf(filename)
      logger.info('{} has been created.'.format(filename))