QPushButton -执行while循环，直到未单击按钮

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

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

    def initUI(self):
        self.setWindowTitle("QPushButton Example")
        self.setGeometry(300, 300, 250, 150)

        self.button = QPushButton("Click me", self)
        self.button.setGeometry(50, 50, 150, 50)
        self.button.clicked.connect(self.buttonClicked)

    def buttonClicked(self):
        self.buttonClickedFlag = True

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.show()

    # 执行while循环，直到未单击按钮
    mainWindow.buttonClickedFlag = False
    while not mainWindow.buttonClickedFlag:
        app.processEvents()

    # 在按钮单击后执行的代码
    print("按钮已单击")

    sys.exit(app.exec_())