Why have you used sudo? You will need to do some additional stuff if it needs sudo.
Use which python to find the path to python. Possibly /usr/bin/python.
When you get an error in the exec node add debug nodes to all outputs, set them to Output Complete Message (that is important) and check all the contents of the messages. Somewhere there will probably be an error message.
Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
The OpenJS Foundation | Terms of Use | Privacy Policy | OpenJS Foundation Bylaws | Trademark Policy | Trademark List | Cookie Policy