[Python] How to fix "Attempted relative import in non-package" even with __init__.py

I'm trying to follow PEP 328, with the following directory structure:

pkg/
__init__.py
components/
core.py
__init__.py
tests/
core_test.py
__init__.py


In core_test.py I have the following import statement

from ..components.core import GameLoopEvents


However, when I run, I get the following error:

tests$ python core_test.py
Traceback (most recent call last):
File "core_test.py", line 3, in <module>
from ..components.core import GameLoopEvents
ValueError: Attempted relative import in non-package


Searching around I found "relative path not working even with __init__.py" and "Import a module from a relative path" but they didn't help.

Is there anything I'm missing here?

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