Hi,
I'm following a tutorial that sets up a button to execute some python code once.
Cannot get the button to execute the code at all. However, when I enter “edit expression” and Apply, it does turn into executable code however it runs many times over automatically.
Attached file has both example nodes.

Thanks in advance!

Running 17.0.493 Indie on Mac 10.13.6

you callback is:
which will merely return the python code as string

you have to do something like this
to have it executed

Amazing! Thank you Thomas.