The PyQt4.QtGui.QPen.setColor() method is used in Python with the PyQt4 module to set the color of a QPen object. The QPen class provides a set of functions to set and query different properties of the pen, such as color, style, and width. By using the setColor() method, we can easily specify the desired color for the pen, allowing us to customize the appearance of graphics in our PyQt4 application.
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