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?
To elaborate on Ignacio Vazquez-Abrams's answer:
The Python import mechanism works relative to the __name__
of the current file. When you execute a file directly, it doesn't have its usual name, but has "__main__"
as its name instead. So relative imports don't work.
You can, as Igancio suggested, execute it using the -m
option. If you have a part of your package that is meant to be run as a script, you can also use the __package__
attribute to tell that file what name it's supposed to have in the package hierarchy.
See http://www.python.org/dev/peps/pep-0366/ for details.