This page describes only how to direct signals from XML to Python code. There is a lack of description of other interaction types. - `interface element 1`[ --> `python code`?] --> `interface element 2` Examples: - to turn off one GtkRadioButton when another GtkRadioButton is on - to open GtkFileChooserNative by pressing GtkButton - [`interface element 1` --> ]`python code` --> `interface element 2` Example: - to run GtkSpinner when a certain part of Python code is being executed