在python中使用Qpainter在标签内部绘制矩形

from PyQt5.QtWidgets import QApplication, QLabel
from PyQt5.QtGui import QPainter, QColor
from PyQt5.QtCore import Qt

class CustomLabel(QLabel):
    def __init__(self, parent=None):
        super().__init__(parent)

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setPen(Qt.red)  # 设置画笔颜色为红色
        painter.setBrush(QColor(255, 0, 0, 100))  # 设置填充颜色为半透明红色
        painter.drawRect(10, 10, 100, 100)  # 绘制矩形，起始点坐标为(10, 10)，宽高为100

if __name__ == '__main__':
    app = QApplication([])
    label = CustomLabel()
    label.show()
    app.exec_()