The `addAction` method in `PyQt4.QtGui.QMenu` class is used to add an action to the menu. An action can be a command, a shortcut, or a submenu. This method allows the programmer to define the text that will be displayed for the action, an optional icon, and a callback function that will be invoked when the action is triggered. This method provides a flexible way to create interactive menus in PyQt4 applications.
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