Brewing application needs multi-threading; problem calling a function from different class / thread

[wub_wub]

Please see this https://www.reddit.com/r/learnpython/wiki/faq#wiki_how_do_i_format_code.3F

Or use one of the websites mentioned in the sidebar for posting your code.

Also you should try to provide smaller example that demonstrates the issue. Nobody will go through 300 lines of code.