You can show it on the desktop. On the dashboard you can present data that is prepared & delivered by the python program. To make that happen you will need to implement that feature in the python program and then catch the data in NR -> Dashboard
To show the application window on the desktop, you can try the following command in the exec node:
export DISPLAY=:0 && lxterminal -e python /path to file/mypython.py
assuming you are running it in a RPi
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