The method "setFilter" in PyQt5.QtWidgets.QFileDialog is used to set the filter for the file dialog. A filter is a way to specify which types of files should be displayed or allowed in the file dialog. It is used to restrict the user's selection to a specific file type or group of file types. By using this method, developers can define the filter based on the file extensions, MIME types, or any other criteria. This helps in providing a more focused and efficient file selection experience to the user.
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