On Fri, 5 Feb 2016 08:15:21 -0500
Gene Heskett <gheskett@...> wrote:

> Greetings guru's;
> 
> This did work before the 51 tde updates yesterday:
> 
> gene@GO704:~/linuxcnc$ python python_opencv_camera_example_with_gui.py
> Traceback (most recent call last):
>   File "python_opencv_camera_example_with_gui.py", line 278, in <module>
>     main()
>   File "python_opencv_camera_example_with_gui.py", line 222, in main
>     root = Tk()
>   File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1712, in __init__
>     self.tk = _tkinter.create(screenName, baseName, className, 
> interactive, wantobjects, useTk, sync, use)
> _tkinter.TclError: unknown color name "BACKGROUND"
> 
> This has been a  dog & pony show I have been to before, several times, 
> and each time IIRC the fix was different.  Historically, if by playing 
> the 10,000 monkeys with typewriters scene long enough that I manage to 
> fix 'BACKGROUND' the FOREGROUND will be the next excuse used to exit a 
> formerly working script.
> 
> Does anyone have a clue what to fix this time?
> 

In addition to already posted .xsession solution you can:
a) Delete content of /opt/trinity/share/apps/tdedisplay/app-defaults (this
is probably what you did last time if update caused this to reappear)
b) Deselect "Apply colors to non-tde applications". But this have much wider
implications and generally undesirable "solution".

This bug was reported years ago. Also its not python that fails, its
specifically tkinter - almost all other apps reacts to bullshit in
xresources adequately (throw warning and use some sane defaults)

-- 
  Nick Koretsky (nick.koretsky@...)