I have a Tkinter GUI where there is a Scale object.  I have a callback assigned (by the command constructor parameter) to perform an action when the user changes the scale position.  However, there is also a case where the value represented by the scale is modified externally, and so I set the scale position using Scale.set().  In this case, I want to set the scale, but not trigger the callback, since the rest of the program already knows about the change.  However, I notice that the callback is indeed triggered by set().
Is it possible to do one of:

Set the scale value without triggering the callback.
Differentiate in the callback whether it was triggered by user interaction or by Scale.set() being called.

Thanks.
There is nothing specifically built-in to Tkinter to solve this. It's really a simple problem to solve though: remove the callback, set the value, add the callback. Or, set a global flag and check for that flag in the callback.
There are ways to solve the problem -- subclass the widget, for example -- but that doesn't really buy you anything. Just go with the simple solution and move on to more interesting problems.
Tkinter: Set a 'scale' value without triggering callback?