not sure why I always struggle with relative imports…

usually I have this structure

- project
  - package1
      some.py
  - package2
  - tests
     tests_package1.py

where tests_package1.py starts with

from ..packe1.some import some

however I get “attempted relative import with no known parent package” and depening on where I have which init.py other errors.

here I found many suggestions but all fail in one or the other way

how to correctly import a class some in some.py to the tets_package1.py ?