The `setVerticalStretch` function is part of the `QSizePolicy` class in the PyQt5.QtWidgets module of Python. This function allows you to specify the vertical stretching factor for a widget. By setting a higher value for the vertical stretch, you can make the widget expand more vertically when its parent layout is resized. This can be useful for adjusting the relative size of widgets within a layout to achieve a desired layout behavior.
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