圆边无框窗口上的边框问题(pyqt5)

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

class MyWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowFlags(Qt.FramelessWindowHint)  # 设置无边框窗口
        self.setAttribute(Qt.WA_TranslucentBackground)  # 设置窗口背景透明

def paintEvent(self, event):
    painter = QPainter(self)
    painter.setRenderHint(QPainter.Antialiasing)  # 抗锯齿
    painter.setPen(Qt.NoPen)  # 无边框
    painter.setBrush(Qt.white)  # 白色背景
    painter.drawRoundedRect(self.rect(), 10, 10)  # 绘制圆角矩形

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec_())