import module from a sibling directory in python3.10

Question

There are 10+ SO posts about this already, none of the answers works for me and I still haven't seen an example of someone importing something from a sibling directory.

src
    __init__.py
    test.py
    package1
        __init__.py
        module1.py
    package2
        __init__.py
        module2.py

(_init_.py should not be necessary on python versions greater than 3.3 but I still have them there as they make no difference)

in test.py I have

import package1.module2

and it works fine however the problem is when I want to import something from package2 to package1, and vice versa. I have tried different import methods in module2.py and I receive these different error messages:

import src.package1.module1.py

with the error:

ModuleNotFoundError: No module named 'src'

and

from .. import package1

with the error:

ImportError: attempted relative import with no known parent package

The top answer here: How do I import a Python script from a sibling directory? also give me the exact error message as I showed above. The answers here: How to import a Python module from a sibling folder? changes nothing. Am I missing something or should it not be possible to import stuff between different folders/packages? Do I need the "sys.path hack"?

Answer 1

I gave almost all of the solutions given for similar questions a try, but none of them worked for me! However, after banging my head to the wall, I found out that this solution does work by just removing one dot:

import sys
sys.path.append('..')

Just remove one dot from string within append method, i.e.:

sys.path.append('.')

or your can use:

sys.path.insert(0, '.')

Then you can import any module from a sibling folder. I tried this using python 3.9.13 and it worked well.