[Python] python import from sibling folder

I am trying to import a module from a python file that is in a sibling folder. I read several similar questions here and tried to apply solutions listed there, but I wasn't able to solve the problem.

The structure is as follows:

parentfolder/gfolder/codefolder/fileA.py
parentfolder/gfolder/utilfolder/util.py


gfolder, codefolder and utilfolder all have an __init__.py.

I'm trying to do in fileA.py:

import gfolder.utilfolder.util as util


I also tried adding before the import statement:

sys.path.append(".../parentfolder/")


And that didn't work either:

import gfolder.utilfolder.util as util
ModuleNotFoundError: No module named 'gfolder'


The solution in a similar question says to include __init.py__ in the directories, which I already have.

EDIT: Now both sys.append and sys.insert work and the problem was that I included a slash at the end of the path. When I took it out, everything worked.

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