wx, wxPython and Linux Desktop Standard paths.

Hello list,
I had asked this over in wxpython-users, but it seems to have hit a 
dead-end. I'm joining the dev list to try again, because it might be more 
appropriate. I hope this is okay.

According to the freedesktop spec, see *, typical user data and config 
paths should be:
* Spec: 
https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

XDG_DATA_HOME = ~/.local/share/
XDG_CONFIG_HOME = ~/.config/

I am testing wxPython 4 in a "venv" (python3 -m venv etc.) wherein I used 
pip to install wxPython on Ubuntu 16.04

Looking into wx.StandardPaths, I find:

(test1) donn@ddm:~/.../test1/bin$ python
Python 3.5.2 (default, Nov 23 2017, 16:37:01) 

>>> import wx
>>> app=wx.App()
>>> sp=wx.StandardPaths.Get()

>>> sp.GetUserDataDir()
'/home/donn/.python'
(I dunno what this is. I've never seen a ~/.python directory!)

>>> sp.GetConfigDir()
'/etc'
(Okay, I'm thinking this might be a root thing. Fair enough.)

>>> sp.GetUserLocalDataDir()
'/home/donn/.python'
(I expect "/home/donn/.local/share" here.)

>>> sp.GetUserConfigDir()
'/home/donn'
(I expect "/home/donn/.config" here.)

>>> sp.GetLocalDataDir()
'/etc/python'
(I don't understand this one either.)

I cannot seem to find the strings that agree with the spec paths as per 
XDG_DATA_HOME and XDG_CONFIG_HOME.

I tried wxPython's demo of StandardPaths, with no better results. There are 
a lot of nice variables that hint at what I want, but they all return 
strange paths.

It's rather NB for my app to get the Linux paths right. I need to reach 
into the ~/.config/fontconfig/ directory -- which can't be a hard-coded 
string. 

Currently, I'm using GLib (the "python-gi" package) to fetch the XDG paths, 
which is another dependency. It feels like it should not be necessary 
because the "stack", in my case, goes:
wxPython -> wx ->  (GTK + GLib + et al.). Meaning GLib is already there, 
under the surface. I would think it could make the correct paths available 
upwards. Perhaps wx is not doing the right XDG thing?

Any ideas? Am I doing something dumb?

Thanks!
/d 
<https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html>

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