如何在PyQt中获取Qtwidget的原生样式？

from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtCore import Qt

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.setStyleSheet("")

if __name__ == '__main__':
    app = QApplication([])
    widget = MyWidget()
    widget.show()
    app.exec_()