The `addSpacerItem` method in PyQt5.QtWidgets.QHBoxLayout is used to add an empty space, also known as a spacer item, to a horizontal layout. This spacer item helps in distributing the available space evenly among the other widgets in the layout. The `addSpacerItem` method takes the spacer item as a parameter and adds it to the layout. This method is commonly used to ensure proper alignment and spacing within the horizontal layout.
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