docs: def cvParamFromDict(attributes):
      """Python representation of a mzML cvParam = tuple(accession, value,
      unitAccession).
  
      :param attributes: #TODO: docstring
  
      :returns: #TODO: docstring
      """
      keys = ['accession', 'value', 'unitAccession']
      return tuple(attributes[key] if key in attributes else None for key in keys)