The `addButton` method in PyQt5.Qt.QDialogButtonBox allows you to add a custom button to a dialog button box widget. This method takes several parameters, such as the button text, button role, and parent widget. The button role specifies the action that the button performs, such as accepting, rejecting, or resetting the dialog. By using this method, you can create dialog button boxes with custom buttons that suit your specific needs in a PyQt5 application.
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