The `setBold` function in the PyQt5.QtGui.QFont class is used to set the boldness of a font. By calling this function with a boolean parameter, it allows the user to specify whether the font should appear in bold or not. When the `setBold` function is called with a parameter of `True`, the font is set to bold, and when it is called with a parameter of `False`, the font is set to its default state (not bold). This function is commonly used in PyQt5 applications to customize the appearance of text elements and provide emphasis where needed.
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