_tkinter.TclError: can't set "PY_VAR0": invalid command name "-1210125972check"

Gregor Horvath g.horvath at gmx.at
Thu Mar 2 18:55:32 CET 2006

Gregor Horvath schrieb:

> if __name__ == "__main__":
>   t = testtk()
>   t.var.set("TEST")
> Result:
> _tkinter.TclError: can't set "PY_VAR0": invalid command name 
> "-1210125972check"
> Any ideas, why I cant set the variable var?

Ok. The problem is that the program enters the mainloop on t = testtk() 
and t.var.set("TEST") is executed when the program ends.

But, what I want to do is to let another program create my tkinter GUI 
via initiating my class through COM. Then the COM-Client should be able 
to set values of the tkinter variables from "the outside".

How to do this?

Do I have to make my GUI program threaded ? like described here:


The mainloop resides in one thread and the other thread provides the COM
object and queues the foreign COM method calls to the GUI thread?

Is there a simpler solution?


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