Settings file reference is not found

Question

I'm working on migrating an exsting Python 2.7 project to Python 3.9. I'm facing a directory structure-related issue in Python 3.

My current project directory structure is:

├───project
│ ├───core
| +--__init__.py
| +--main.py
| +--settings.py
│ ├───jobs
| +--job.py

main.py:

import settings
class Main:
 def __init__(self, a=None, b=settings.B):
 self.a = a
 self.b = b
 def start(self):
 print(self.a, self.b)

job.py:

import sys
# sys.path.insert(0, '../core/')
from core.main import Main
from core import settings
main = Main(settings.A)
main.start()

There is no issues with this structure when Python 2.7 interpreter is used, but in Python 3.9 I see the following error when job.py is executed:

 File "project\core\main.py", line 1, in <module>
 import settings
ModuleNotFoundError: No module named 'settings'

The issue is fixable by uncommenting the code on line #2 of the job.py script, but I would like to avoid hardcoding folder values like that. I would appreciate if someone could provide an alternative approach and an explanation why it's behaving this way in the newer Python version.

Answer 1

Due to ambiguity absolute import was removed in python3 for such use case. (This explains it very well: Changes in import statement python3)

You can use relative import for this use case maybe - https://docs.python.org/3/reference/import.html#package-relative-imports