The `setDirectory` method in `QFileDialog` class in the `qtpy.QtWidgets` module is used to set the directory that should be shown when the file dialog is opened. By specifying the directory path as a parameter to this method, the file dialog will initially display the contents of that directory. This method is commonly used to provide a default directory for users to select files from, making it more convenient for them to navigate and locate their desired files.
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