Tkinter: user vs. program events

[effbot at pythonware.com]

Andrew Kuchling wrote:
> > why not just add a semaphore?
>
> That's what I first thought, but it doesn't work. /.../
> The solution is probably "Don't do that, then"

some further digging makes me think that this
could work:

   light_var = FloatVar()
   light_scale = Scale(command=adjust, variable=light_var)

to change the setting, update list_var, not the
widget itself:

   light_var.set(value)

the scale implementation contains special code to
avoid calling the command callback if the variable
value changes, so this should work.

</F>


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