PyQt5报错：Destroyed while thread is still running

PyQt5报错：Destroyed while thread is still running

import sys
import time

from PyQt5.QtWidgets import QApplication, QPushButton, QDateTimeEdit, QWidget, QVBoxLayout
from PyQt5.QtCore import pyqtSignal, pyqtBoundSignal, QThread
import window2


class Window(QWidget):
	def __init__(self):
		super(Window, self).__init__()

		self.setWindowTitle("window1")
		self.countButton = QPushButton()
		self.dateTimeEdit = QDateTimeEdit()

		self.button = QPushButton()
		# self.button.clicked.connect(self.a)

		self.vLayout = QVBoxLayout(self)
		self.vLayout.addWidget(self.countButton)
		self.vLayout.addWidget(self.dateTimeEdit)
		self.vLayout.addWidget(self.button)

		#  countSignal = signal()
		#  countSignal.start()

        # 加self即可，具体原因不清楚
        #  self.countSignal = signal()
        #  self.countSignal.start()

class signal(QThread):
	countSignal: pyqtBoundSignal
	countSignal = pyqtSignal(int)

	def __init__(self):
		super(signal, self).__init__()
		self.number = 0

	def run(self):
		while 1:
			print(self.number)
			self.countSignal.emit(self.number)
			time.sleep(1)
			self.number += 1


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