Qt for Python (PySide/Shiboken)

Notify signals typically carry the new value, like https://doc.qt.io/qt-6/qlineedit.html#textChanged, so I’d include that. Otherwise the receiver has to go lengths retrieving the new value, if they want to do something with it. Also, you probably shouldn't mix both styles and produce camelCase_snake_case. That's neither Qt's naming scheme nor Pythonic according to PEP8 style. Either have run_filter and run_filter_changed, or runFilter and runFilterChanged. And yeah, the last doesn't assign it to a Python variable, so it gets garbage collected immediately, and may cause RuntimeErrors later.