Python 2.7 and "ValueError: Attempted relative import in non-package"

Python 2.7 and "ValueError: Attempted relative import in non-package" - Printable Version

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Python 2.7 and "ValueError: Attempted relative import in non-package" - bkiziuk - 2019-04-14

I've been trying to adjust my code to be both Python 2&3 friendly, based mainly on kodi.wiki but also Googling around as it doesn't work even if everybody says that it should.

I have structure:

Code:
service.subsmangler/

----resources/

--------__init__.py

--------lib/

------------__init__.py

------------common.py

------------contextmenu.py

In contextmenu.py I need to import common.py, so in Python 2 I had just:

python:
import common

Now, in order to adjust it also to Python 3, all sources say that this should be changed to:

python:
from __future__ import absolute_import

from . import common

but after changing it, I get an error in Kodi log saying:

Code:

2019-04-14 18:15:58.775 T:140410114529024   ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--

                                             - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!

                                            Error Type: <type 'exceptions.ValueError'>

                                            Error Contents: Attempted relative import in non-package

                                            Traceback (most recent call last):

                                              File "/home/kiziuk/.kodi/addons/service.subsmangler/resources/lib/contextmenu.py", line 9, in <module>

                                                from . import common

                                            ValueError: Attempted relative import in non-package

                                            -->End of Python script error report<--

Is there anything that I'm still missing?

RE: Python 2.7 and "ValueError: Attempted relative import in non-package" - pkscout - 2019-04-14

I'll preface this by saying that I'm a Python amateur that has learned as I went. That said, with the exception of my Kodi addons, all the Python work I do is in Python3, so hopefully this advice will be right (if not the most Pythonic way). I'm pretty sure from contextmenu.py you can just use the same format you did for Python2. At least I have and haven't run into any problems.

RE: Python 2.7 and "ValueError: Attempted relative import in non-package" - gujal - 2019-04-14

Try with

python:


from resources.lib import common

RE: Python 2.7 and "ValueError: Attempted relative import in non-package" - bkiziuk - 2019-04-15

(2019-04-14, 22:56)gujal Wrote: Try with
python:


from resources.lib import common

I tried it as well:

Code:
2019-04-15 18:01:25.901 T:139931410380544   ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--

                                             - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!

                                            Error Type: <type 'exceptions.ImportError'>

                                            Error Contents: No module named resources.lib

                                            Traceback (most recent call last):

                                              File "/home/kiziuk/.kodi/addons/service.subsmangler/resources/lib/contextmenu.py", line 9, in <module>

                                                from resources.lib import common

                                            ImportError: No module named resources.lib

                                            -->End of Python script error report<--

This is the thing I don't really understand.
If there's __init__.py file, the whole directory should be treated as a package. I believe I simply don't understand how it works under the hood, but all tutorials say "make __init__.py file" and apparently for majority of the people this just works Confused

RE: Python 2.7 and "ValueError: Attempted relative import in non-package" - Roman_V_M - 2019-04-16

@bkiziuk Let me guess, contextmenu.py is your entry-point script. Entry-point scripts are not considered a part of a package (their own location path prevails when resolving module/package names) so relative intra-package import syntax does not apply here.