Problem with the import bluetooth!

Question

I have tried a lot of this lines programs but the terminal it keep's complaint.

Error message: Import Error:No module named bluetooth._bluetooth

I have install some lib but again the problem it shows. The code is not mine, I have take from here: https://github.com/bowdentheo/BLE-Beacon-Scanner/blob/master/BeaconScanner.py

--Part code:

import ScanUtility
import bluetooth._bluetooth as bluez
#Set bluetooth device. Default 0.
dev_id = 0
try:
  sock = bluez.hci_open_dev(dev_id)
  print ("\n *** Looking for BLE Beacons *\n")
  print ("\n * CTRL-C to Cancel ***\n")
except:
  print ("Error accessing bluetooth")
ScanUtility.hci_enable_le_scan(sock)
#Scans for iBeacons
try:
  while True:
      returnedList = ScanUtility.parse_events(sock, 10)
      for item in returnedList:
          print(item)
          print("")
except KeyboardInterrupt:
  pass