Python/Tkinter crash.

Hendrik van Rooyen mail at
Wed Oct 4 10:33:55 CEST 2006


I get the following:

hvr at LINUXBOXMicrocorp:~/Controller/lib> python
UpdateStringProc should not be invoked for type font

and I am back at the bash prompt - this is most frustrating, as there is no
friendly traceback to help me guess where its coming from.

And what is worse, the script runs for a varying time before it simply exits
like this.

What can I do to dig deeper to try to find a clue? - I don't even know if its
Python, Tkinter or Linux...

Some background:

The application is a prototype gui for a controller of an injection moulding
It has two rows of five buttons across the top, and a canvas containing various
objects over the rest of the screen.
Extensive use is made of configure to change the text of the buttons, as well as
their command bindings,
to keep "the state of the system" current - its quite a hack at this time, as I
am still experimenting with getting the interface intuitive.
On the canvas, there are multiple instances of a Meter class to show things like
temperatures and pressures,
as well as a schematic representation of the machine, created out of polygons
and lines.
The schematic, as well as the Meters, are crudely animated by deleting and
redrawing the objects repetitively with slightly different parameters in
response to button presses. This is done by starting different threads to
implement the various motions, which repetitively call kill and draw methods in
the main app, after which they (the threads) commit seppoku by returning.

Everything seems to work fine. - there is a thread that runs to move the meter
values around continuously, and this has been stable for some time now, and I
can get the various "machine" parts to move around the screen by pushing the
The trouble occurs when I put the "machine" into Auto mode, simulating the
various motions in a loop, - it runs for anything from a few tens to a few
hundreds of cycles before handing in its dinner pail like this.

Any Ideas on what to do next to find the culprit?

- Hendrik

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