Import Sibling Directory (yet again)

Import Sibling Directory (yet again)

I have the following directory structure:
src/
main/
somecode/
A.py
B.py
__init__.py
__init__.py
test/
somecode/
testA.py
testB.py
__init__.py
__init__.py
__init__.py
I was able to successfully add the following to the test modules:
import sys
sys.path.insert(0, "absolute path to src")
which allowed me to run nosetests from the src folder. But the problem is
when other people use my code, this doesn't work because their absolute
path doesn't is different.
So then I tried:
import sys, os
sys.path.append(os.path.abspath('../../../main/somecode')
from main.somecode import A
which worked great from src/test/somecode, but I can't run nosetests from
the src folder since the relative path doesn't work from there.
I also tried to do from ...main.somecode import A but it doesn't like that
even though they are all python packages.
So what do I do? This seems like a potential answer but he doesn't explain
where to add the code.