PyQt5:如何在多次重写后恢复默认游标？

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

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

    def enterEvent(self, event):
        # 设置自定义的游标样式
        self.setCursor(Qt.PointingHandCursor)

    def leaveEvent(self, event):
        # 恢复默认的游标样式
        self.unsetCursor()

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