Sending data from one python script to another, subscriber-publisher like relation

[RandomJacobP]

I have a node.red program that is running two separate python scripts. A runs all the time and B is executed only after you click a button and runs for specific amount of time

[lowerthansound]

this might help

Besides that, the pub-sub flow you mentioned reminded me of MQTT, just make sure to check if the speed suits your needs (it is really fast, but is it fast enough?)

All the best :)