返回一个值并关闭对话框。

I'm working on a user interface in PyQt, and I'm running into a few problems trying to use QDialog. Essentially I have a main widget and a sub-widget, saved in separate .py files; I would like the sub-widget to open when I click a certain button in the main widget. This seems to be opening fine.I'm working on a user interface in PyQt, and I'