如何在QWidget中实现mouseEnter和mouseLeave事件？

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

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

    def mouseMoveEvent(self, event):
        if self.rect().contains(event.pos()):
            # 鼠标进入QWidget
            print("mouseEnter")
        else:
            # 鼠标离开QWidget
            print("mouseLeave")

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