# pybedtools.bedtool.BedTool.liftover

BedTool.liftover(chainfile, unmapped=None, liftover_args='')

  Returns a new BedTool of the liftedOver features, saving the unmapped ones as `unmapped`. If `unmapped` is None, then discards the unmapped features.

  `liftover_args` is a string of additional args that is passed, verbatim, to liftOver.

  Needs `liftOver` from UCSC to be on the path and a `chainfile` downloaded from UCSC.