当我隐藏小工具时，如何阻止PyQt5删除它们？

import sys
from PyQt5.QtWidgets import QApplication, QWidget

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

    def closeEvent(self, event):
        # 隐藏窗口而不删除
        self.hide()
        event.ignore()

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