def _PerformDownloadOptions(self, parser):
    self._PerformLoadOptions(parser)
    parser.add_option('--filename', type='string', dest='filename',
                      action='store',
                      help='The name of the file where output data is to be'
                      ' written. (Required)')
    parser.add_option('--kind', type='string', dest='kind',
                      action='store',
                      help='The kind of the entities to retrieve.')
    parser.add_option('--exporter_opts', type='string', dest='exporter_opts',
                      help='A string to pass to the Exporter.initialize method.'
                     )
    parser.add_option('--result_db_filename', type='string',
                      dest='result_db_filename',
                      action='store',
                      help='Database to write entities to for download.')
    parser.add_option('--config_file', type='string', dest='config_file',
                      action='store',
                      help='Name of the configuration file.')
Return a score indicating how two names are similar.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/appcfg.py/AppCfgApp._PerformDownloadOptions--crossover with--dataset/ETHPy150Open ducksboard/libsaas/libsaas/services/fullcontact/resource.py/Name.similarity