Import module from another directory for Unit Tests

I have the following directory structure:

Master -------Tests |-----------test_extract.py -------Scripts |-----------extract.py 

This I'm trying to do a unit test file for extract.py. However, I'm receiving the following error:

"not {}".format(type(path)))

RuntimeError: 'path' must be None or a list, not >'_frozen_importlib_external._NamespacePath'>

This is how I'm trying to import the extract module:

import unittest import sys print (sys.path[0]) sys.path.insert(0, sys.path[0]+'\\Scripts') from Scripts import extract 

I'm using Python 3.5. Please advice.

Thanks