code: def rename_file(source, dest):
      
      logger.debug('nlpia.loaders.rename_file(source={}, dest={})'.format(source, dest))
      if not isinstance(source, str):
          dest = [dest] if isinstance(dest, str) else dest
          return [rename_file(s, d) for (s, d) in zip_longest(source, dest, fillvalue=[source, dest][int(len(source) > len(dest))])]
      logger.debug('nlpia.loaders.os.rename(source={}, dest={})'.format(source, dest))
      if source == dest:
          return dest
      os.rename(source, dest)
      return dest
docs: Rename (mv) file(s) from source to dest
  
      >>> from tempfile import mkdtemp
      >>> tmpdir = mkdtemp(suffix='doctest_rename_file', prefix='tmp')
      >>> fout = ensure_open(os.path.join(tmpdir, 'fake_data.bin.gz'), 'w')
      >>> fout.write(b'fake nlpia.loaders.rename_file')
      30
      >>> fout.close()
      >>> dest = rename_file(os.path.join(tmpdir, 'fake_data.bin.gz'), os.path.join(tmpdir, 'Fake_Data.bin.gz'))
      >>> os.path.isfile(os.path.join(tmpdir, 'Fake_Data.bin.gz'))
      True