如何在PyQt5中删除QGroupBox中的所有小部件？

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QGroupBox, QVBoxLayout, QPushButton

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("Delete Widgets Example")
        self.setGeometry(100, 100, 300, 200)

        self.group_box = QGroupBox("Group Box", self)
        self.group_box.setGeometry(50, 50, 200, 100)

        layout = QVBoxLayout()
        self.group_box.setLayout(layout)

        button1 = QPushButton("Button 1")
        button2 = QPushButton("Button 2")
        button3 = QPushButton("Button 3")

        layout.addWidget(button1)
        layout.addWidget(button2)
        layout.addWidget(button3)

        delete_button = QPushButton("Delete Widgets", self)
        delete_button.setGeometry(100, 160, 100, 30)
        delete_button.clicked.connect(self.delete_widgets)

    def delete_widgets(self):
        # 获取QGroupBox中的所有小部件
        widgets = self.group_box.children()

        # 遍历并删除小部件
        for widget in widgets:
            self.group_box.layout().removeWidget(widget)
            widget.deleteLater()

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