pyqt 问题，求助

环境：windows Python 3.6.5 非常简单的一个 qt 应用，代码如下

from PyQt5 import QtCore import sys from PyQt5.QtWidgets import QApplication, QMainWindow class Ui_MainWindow(object): def setupUi(self, MainWindow): MainWindow.setObjectName("MainWindow") MainWindow.resize(985, 635) class MyWindow(QMainWindow, Ui_MainWindow): def __init__(self, parent=None): super(MyWindow, self).__init__(parent) self.setupUi(self) def test(self,b): print(b) app = QApplication(sys.argv) myWin = MyWindow() class MyThead(QtCore.QThread): updated = QtCore.pyqtSignal(str) def __init__(self, msg): super().__init__() self.msg = msg def run(self): self.updated.emit(self.msg) #--------------后半部分 _thread = MyThead('123') _thread.updated.connect(myWin.test) _thread.start() myWin.show() app.exec() 

运行起来没问题

但是如果把后面几行

_thread = MyThead('123') _thread.updated.connect(myWin.test) _thread.start() 

放到方法里面，也就是代码后半部分变成

def _(): _thread = MyThead('123') _thread.updated.connect(myWin.test) _thread.start() _() myWin.show() app.exec() 

gui 直接崩溃，也没有报错，只有一个因异常导致的 QThread: Destroyed while thread is still running

这里折腾一天了才排查到这个地方，文档也没找到相关内容...