When I run this code in python 2.7, I get this error:
Traceback (most recent call last):
File \"C:\\Python26\\Lib\\site-packages\\pyutilib.subprocess-3.5.4\\
This error comes when you append this line os.path.join(os.path.dirname(__file__)) in python interactive shell.
Python Shell doesn't detect current file path in __file__ and it's related to your filepath in which you added this line
So you should write this line os.path.join(os.path.dirname(__file__)) in file.py. and then run python file.py, It works because it takes your filepath.