I have this in my Docker:

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        self.check_show_background = QCheckBox("Show Background", self.mainWidget)
        self.check_show_background.toggled.connect(lambda:self.button_state(self.check_show_background)) # yia boiiiii
        self.mainWidget.layout().addWidget(self.check_show_background)

    @pyqtSlot(bool)
    def button_state(self,button):
        print("button_state", button.text(), button.isChecked())
        if button.text() == "Show Background":
            if button.isChecked() == True:
                ext.show_background(True)
                print("yas")
            else:
                ext.show_background(False)
                print("no")


and when I use the CheckBox the first line of button_state prints out this:

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button_state Show Bac&kground True
button_state Show Bac&kground False
button_state Show Bac&kground True
button_state Show Bac&kground False
button_state Show Bac&kground True


How does the & get there?

The ampersand denotes the Keyboard Shortcut (Accelerator), so in your dialogue, when you can press "k" to get to that checkbox quickly. It should be underlined in your dialog, too. Looks like Qt automatically assigns accelerators if you don't set them yourself?

rbreu wrote:The ampersand denotes the Keyboard Shortcut (Accelerator), so in your dialogue, when you can press "k" to get to that checkbox quickly. It should be underlined in your dialog, too. Looks like Qt automatically assigns accelerators if you don't set them yourself?

Ok, it's not underlined, but the explanation is clear. I followed a tutorial, bumped into that problem and sorted my way out. But thanks for the information!