how to solve RuntimeError when QMessageBox show

[3293406747]

QMessageBox.information not use await when run asynico task at task1, but it try to enter into task2 so that RuntimeError.
error messasge

任务1开始
任务2开始
任务1运行中
Exception in callback Task.task_wakeup(<Future finished result=None>)
handle: <Handle Task.task_wakeup(<Future finished result=None>)>
Traceback (most recent call last):
 File "lib\asyncio\events.py", line 80, in _run
 self._context.run(self._callback, *self._args)
RuntimeError: Cannot enter into task <Task pending name='Task-2' coro=<MyWindow.task2() running at demo.py:31> wait_for=<Future finished result=None>> while another task <Task pending name='Task-1' coro=<MyWindow.task1() running at demo.py:26>> is being executed.

python code

import asyncio
import sys

import qasync
from PySide6.QtWidgets import QMainWindow, QMessageBox, QPushButton, QApplication


class MyWindow(QMainWindow):
 def __init__(self):
 super().__init__()
 self.resize(400, 300)
 self.show()
 self.button = QPushButton("按钮", self)
 self.button.clicked.connect(self.create_tasks)
 self.button.show()

 def create_tasks(self):
 """创建任务"""
 asyncio.create_task(self.task1())
 asyncio.create_task(self.task2())

 async def task1(self):
 print("任务1开始")
 await asyncio.sleep(0)
 print("任务1运行中")
 QMessageBox.information(self, "提示", "任务1已经完成")
 print("任务1完成")

 async def task2(self):
 print("任务2开始")
 await asyncio.sleep(1)
 print("任务2完成")

 def closeEvent(self, event):
 super().closeEvent(event)
 for task in asyncio.all_tasks():
 task.cancel()


if __name__ == '__main__':
 app = QApplication(sys.argv)

 loop = qasync.QEventLoop(app)
 asyncio.set_event_loop(loop)

 myWindow = MyWindow()
 myWindow.show()

 try:
 with loop:
 loop.run_forever()
 except KeyboardInterrupt:
 pass
 finally:
 myWindow.close()
 sys.exit(0)