窗口圆角

def paintEvent(self, event: QPaintEvent):        
    # 圆角
    bmp = QBitmap(self.size())
    bmp.fill()
    painter = QPainter(bmp)
    painter.setRenderHint(QPainter.Antialiasing)
    painter.setPen(Qt.NoPen)
    painter.setBrush(Qt.black)
    painter.drawRoundedRect(bmp.rect(), 6, 6)
    self.setMask(bmp)