How to not shoot yourself in the foot with Python for Qt PyQt

Python PyQt comboBox example python signal slot The following example uses the PyQt_PyObject value declaration with an old-style signal-slot connection, and again when the signal is emitted, python slot The selectionChanged signal passes the QgsMapLayer that had a selection change So, your slot should look like selectedChanged If

python signal slot QT's widgets have predefined slots so that it is possible to directly connect a signal of one widget to a slot of another widget Lesson 1 Python 3, ArcGIS