import error no module named _bluetooth

edit

hello I'm studying ros with raspberry ,ubuntu mate 16.04

I want to ask about blue tooth problem.

I'm already installed bluez,pybluez,python-bluez etc.

I run the bluetooth code in terminal,('sudo python bluetooth_code_files.py')

it has not error,

but create ros package (bluetooth) pkg files , and run same code ,

it had errors,

error named : import error: no module named "_.bluetooth"

I'm studying with this source : https://github.com/switchdoclabs/iBea...