code: def read_last_line(fh, offset=256):
      
      fh.seek(0, 2)
      size = fh.tell()
  
      while offset < size:
          fh.seek(-offset, 2)
          lines = fh.readlines()
          if len(lines) > 1:
              return lines[-1]
          offset *= 2
  
      fh.seek(0, 0)
      return fh.readlines()[-1]
docs: Read last line from a seekable file. Start reading
      from buff before end of file, and double backwards seek
      until line break is found. If reached beginning of file
      (no lines), just return whole file