About Pybluez

I would like to scan multiple terminals using Raspberry 3 model B, but I get an error.
Python is 2.7.9 and bluez is 5.19, using the code at the following URL:
https://github.com/switchdoclabs/iBeacon-Scanner-/blob/master/testblescan.py
The error statement is:

pi@raspberry:~/iBeacon-Scanner-$sudopython testblescan.py
Traceback (most recent call last):
 File "testblescan.py", line 4.in<module>
  import blescan
 File "/home/pi/iBeacon-Scanner-/blescan.py", line 21, In<module>
  import bluetooth._bluetooth as bluez 
ImportErrot: No module named bluetooth._bluetooth

I checked the error and found out that pybluez was not included, so I did the following, but

pi@raspberry:~$pip install pybluez
Requirement already satified (use -- upgrade to upgrade): pybluez in /usr/lib/python 2.7/dist-packages
Cleaning up...

appears.

It's my first time touching raspberry pi and python, so I don't know how to fix it.
I would appreciate it if you could tell me how to solve it.

Also, I thought the python version was bad, so I configured it in python 3.4.2 and ran it

pi@raspberry:~/iBeacon-Scanner-$sudopython3 testblescan.py
  File "testblescan.py", line 16
   sys.exit(1)
             ^
TabError: inconsistent use of tabs and spaces in indication

The error was displayed.
I have no knowledge of python and I don't know how to fix it.

I would appreciate it if you could let me know which version it is.