ImportError: attempted relative import with no known parent package

[Steve Petrie]

Greetings To The CadQuery Mailing List,

I have a problem using a python relative import in a CadQuery app Rendered under CQ-editor 0.7.0.

Although I realize this is a python issue, I am appealing to the CadQuery community for help because, after extensively searching the Internet for solutions to the problem, I found no satisfactory answers posted by the general python community.

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I have constructed a simple test case that recreates the python import error reported in CQ-editor:

ImportError: attempted relative import with no known parent package

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Attachments related to the import problem:

Screenshot from 2026-06-08 12-54-14.png Image of CQ-editor window showing the ImportError mesage;
Screenshot from 2026-06-08 12-54-50.png  Image of CQ-editor window showing CQ-editor  version;

Importer.py python script doing the relative import;
Imported.py python script with function being imported;

ASP -- _test_relative_import - folders ls outputs - 20260608.txt ls listings of folder contents;

test relative import jobstream.txt manually entered shell commands setting PYTHONPATH environment variable and launching CQ-editor 0.7.0

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Project Overview

I am using CadQuery and CQ-editor to design an Elevated Bicycle Expressway (bikeway) to be located in airspace above major urban arterial roadways.

Attached file Elevated Bicycle Expressway (bikeway) - 20221007.odt.pdf shows a graphic of the elevated bikeway structure, missing: concrete bike track, transparent side walls and roof.

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Any assistance mailing list members could provide, in resolving the python import problem, would be greatly appreciated.

Steve Petrie

Etobicoke (Toronto), Canada

ape...@aspetrie.net
416-233-6116

[Steve Petrie]

Greetings To The CadQuery Mailing List,

I have developed a solution to the problem I reported.

The solution introduces a top level main.py script.

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Here is a paste of the complete CQ-editor Log viewer contents (emphasis added):
...
[21:22:30] INFO: Importer.py: *** STARTING *** ...

The value of cwd is: /media/user/7f2b5286-3be6-4eff-b69f-f931cc56c6b9/home/steve/_bikeway/cq3/_test_relatve_import

The value of PYTHONPATH is: /media/user/7f2b5286-3be6-4eff-b69f-f931cc56c6b9/home/steve/_bikeway/cq3/Bikeway_py/_test_relatve_import

The value of __name__ is: folder_A.Importer

The value of __package___ is: /media/user/7f2b5286-3be6-4eff-b69f-f931cc56c6b9/home/steve/_bikeway/cq3/_test_relatve_import/

[21:22:30] INFO: imported.py: *** STARTING *** ...

[21:22:30] INFO: imported.py: *** FINISHED *** ...

[21:22:30] INFO: Importer.py: *** FINISHED *** ...
...

 

Both importer.py and Imported.py start and finish execution.

 

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I include these attachments:
....

Screenshot from 2026-06-09 04-47-36.png screenshot of CQ-editor window at completion of execution;

test relative import jobstream.txt listing of command shell jobstream that exports PYTHONPATH and starts CQ-editor;

 

***NOTE***
Shell script file python_path.sh shown in attachment ASP -- _test_relative_import - folders ls outputs - 20260609.txt is ***NOT USED***

main.py

Importer.py
Imported.py

ASP -- _test_relative_import - folders ls outputs - 20260609.txt  ls listings of folder contents;
...

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Steve Petrie

Etobicoke (Toronto), Canada

ape...@aspetrie.net
416-233-6116

-------- Original Message --------

Subject:	[cadquery] ImportError: attempted relative import with no known parent package
Date:	2026-06-08 14:28
From:	Steve Petrie <ape...@aspetrie.net>
To:	CadQuery - Mailing List <cadq...@googlegroups.com>

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[Jeremy Wright]

If you use the following directory structure, you should not need relative imports.

├── folder_B
│   └── Imported.py
└── Importer.py

Then the import line in Importer.py becomes:

from folder_B.Imported import imported

Also, you can use print and log without imports in CQ-editor, you just lose the ability to set the logging level. I would stick with print if your scripts will be run outside of CQ-editor.

To view this discussion visit https://groups.google.com/d/msgid/cadquery/d1535a73a6ab7904c3fb24c8ee29203c%40aspetrie.net.