Put your python moudle into /include/for_example/ or new a folder inside include.
Add a add_path.py where your main code want to be.
Then code like this...
If you want to new a python module, just add the following code to your add_path.py
sys.path.append(
os.path.join(os.path.dirname(os.path.abspath(__file__)),
'<path>'))
and make sure your < path > is pointing correctly to your python package.
after runing the docker
$ cd ~/LoCoBot-RSA/low_cost_ws/src/rostest_example/scripts/
$ pytest test_import_me.py
$ python3 testing_pypkg_from_arg_utils.py