Dont get it why Gustavo's answer does not work... You initiate only once an instance from that class and import it back into other modules. A fourth easy solution is to add a variable to NSApp() import AppKit app = AppKit.NSApp() app._my_extenstion_name_controller = "foo" this will be accessible everywhere, but this is actually the same as Gustavo's answers, just stored somewhere else :)

Ahhh, that makes sense now. That’s a good tip about __init.py__ as well. Thank you so much for your help, Gustavo!

FYI: if you need to install a package for a specific python you can use pip3.6 install numpy

@gferreira Ah! Ok, thank you. Very helpful! :+1: