old_contents: from wfdb.io.record import (
      Record,
      MultiRecord,
      rdheader,
      rdrecord,
      rdsamp,
      wrsamp,
      dl_database,
      sampfreq,
      signame,
      wfdbdesc,
      wfdbtime,
      SIGNAL_CLASSES,
  )
  from wfdb.io._signal import est_res, wr_dat_file
  from wfdb.io.annotation import (
      Annotation,
      rdann,
      wrann,
      show_ann_labels,
      show_ann_classes,
      mrgann,
  )
  from wfdb.io.download import (
      dl_files,
      get_dbs,
      get_record_list,
      set_db_index_url,
  )
  
  
new_contents: from wfdb.io.record import (
      Record,
      MultiRecord,
      rdheader,
      rdrecord,
      rdsamp,
      wrsamp,
      dl_database,
      sampfreq,
      signame,
      wfdbdesc,
      wfdbtime,
      SIGNAL_CLASSES,
  )
  from wfdb.io._signal import est_res, wr_dat_file
  from wfdb.io.annotation import (
      Annotation,
      rdann,
      wrann,
      show_ann_labels,
      show_ann_classes,
      mrgann,
  )
  from wfdb.io.download import (
      dl_files,
      get_dbs,
      get_record_list,
      set_db_index_url,
  )
  
subject: Remove extraneous blank line.