Python 内核因 PyQt5 GUI 的第二次运行而死机

问题描述

• 在 Python 3.5.2 |Anaconda 4.2.0(64 位)Windows 软件包中使用 Spyder.qt:5.6.0
• 首次运行时，GUI 窗口会按预期打开
• 第二次运行时，没有打开任何东西，并且收到 Kernel dead, restarting 日志消息.

gui1.py:

import sys from PyQt5.QtWidgets import QApplication, QWidget应用程序 = QApplication(sys.argv)w = QWidget()w.resize(250,150) w.show()#sys.exit(app.exec_())app.exec_()

IPhython 日志:

runfile('F:/work/ws_python/TestProj1/gui1/gui1.py', wdir='F:/work/ws_python/TestProj1/gui1')runfile('F:/work/ws_python/TestProj1/gui1/gui1.py', wdir='F:/work/ws_python/TestProj1/gui1')内核死机，重启内核死机，重启内核死机，重启

为什么内核在第二次运行时死机以及如何解决?

(即使在最后一行使用 #sys.exit(app.exec_()) 也是如此.)

此代码解决了问题，感谢提示.

app = QtCore.QCoreApplication.instance()如果应用程序是无:应用程序 = QtWidgets.QApplication(sys.argv)

• Using Spyder in Python 3.5.2 |Anaconda 4.2.0 (64-bit) Windows package. qt: 5.6.0
• For first run, GUI window opens as expected
• For 2nd run, nothing opens, and receiving Kernel died, restarting log message.

gui1.py:

import sys from PyQt5.QtWidgets import QApplication, QWidget

app = QApplication(sys.argv)

w = QWidget()

w.resize(250,150) w.show()

#sys.exit(app.exec_()) 
app.exec_()

IPhython log:

runfile('F:/work/ws_python/TestProj1/gui1/gui1.py', wdir='F:/work/ws_python/TestProj1/gui1')

runfile('F:/work/ws_python/TestProj1/gui1/gui1.py', wdir='F:/work/ws_python/TestProj1/gui1')

Kernel died, restarting

Kernel died, restarting

Kernel died, restarting

Why kernel dies for 2nd run and how to solve it?

(Doing the same even using #sys.exit(app.exec_()) as last line.)

This code fixed the problem, thanks for the hint.

app = QtCore.QCoreApplication.instance()
if app is None:
    app = QtWidgets.QApplication(sys.argv)

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