I have a directory structure similar to the following
meta_project
project1
__init__.py
lib
module.py
__init__.py
I have just found this pretty solution:
import sys; sys.path.insert(0, '..') # add parent folder path where lib folder is
import lib.store_load # store_load is a file on my library folder
You just want some functions of that file
from lib.store_load import your_function_name
If python version >= 3.3 you do not need init.py file in the folder