ImportError on windows due to `os.getenv('HOME')`

[XBlayz]

I have installed the module on my pc (Windows 10 x64 - Python 3.10) and I tried to run the Sample that I found on the main page of the GitHub repository, but when I tray to run it I get this error:

unsupported operand type(s) for +: 'NoneType' and 'str'

What could it be?

[jimy-byerley]

Hello and welcome there !

This quite an odd error since that kind of error is usually not platform or version specific.

• Could you please put the complete backtrace of that error ?
• How did you installed the module ? (pip ?)

[XBlayz]

This is the error VS Code displays to me.

• Yes, I have installed it using pip install pymadcad

[jimy-byerley]

VS Code should be truncating the backtrace in some way so we do not get the full message. This should be reporting at what place in madcad the error is encountered :thinking: Can you try to import madcad from the python commandline instead ?

I never tested madcad on python 3.10 yet And I'm not on windows nor python 3.10 at the moment, so I cannot attempt to reproduce right now

[XBlayz]

This is the result.

>>> import madcad
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "E:\Programmi HDD\Python\lib\site-packages\madcad\__init__.py", line 135, in <module>
    from . import (
  File "E:\Programmi HDD\Python\lib\site-packages\madcad\mesh.py", line 33, in <module>
    from . import displays
  File "E:\Programmi HDD\Python\lib\site-packages\madcad\displays.py", line 8, in <module>
    from .rendering import Display, overrides, writeproperty
  File "E:\Programmi HDD\Python\lib\site-packages\madcad\rendering.py", line 51, in <module>
    from . import settings
  File "E:\Programmi HDD\Python\lib\site-packages\madcad\settings.py", line 66, in <module>
    config = os.getenv('HOME')+'/.config/madcad/pymadcad.yaml'
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

[XBlayz]

I think I have solved the problem. I simply replaced the path of pymadcad.yaml by deleting os.getenv ('HOME'), as if the file is not found it is automatically generated, and now it seems to work. In case you can tell me more let me know, thanks a lot for the help anyway.

[jimy-byerley]

Ok I know what happened: It seems pip installed an old version that is pymadcad-0.8.3 It should have installed it because the latest version pymadcad-0.9.0 has no precompiled package for windows with python-3.10 (and you might have no visual studio toolchain installed to build from source)

The issue with os.getenv('HOME') was solved in pymadcad-0.9.0 by this commit It simply replace getenv('HOME') by a windows equivalent, so the config file is put at the right place in config folders.

I will try to generate prebuilt packages for windows, so you will benefit of all improvements of pymadcad-0.9.0

[XBlayz]

Ok, thanks for the clarification.