Why PyQt is showing “not responding” in title bar of window on my Anaconda (Spyder)?

Question

After running the program in the background, when I execute I get (Not responding in the title bar).

And if I try to close it shows this

And after closing it start giving kernel killing message as shown in the screen on the right side.

I am running "Anaconda-2.3.0-Windows-x86_64". Please tell me what to do.

Answer 1

Spyder does some weird things where it doesn't run code in a new process and so it can keep things around from the last time the code was run. Quite frankly I would find this extremely annoying, and so I don't use Spyder (which means this answer is potentially not perfect, and someone else should probably post another with a better solution!)

What you need to do is check to see if the QApplication already exists, and only create it if does not.

if QApplication.instance():
    app = QApplication.instance()
else:
    app = QApplication(sys.argv)

...

app.exec_()

I think you should always be calling app.exec_() , regardless of whether the QApplication has been created before.

Personally though, I launch python files from a standard windows command line so that I always know it is starting fresh.

Answer 2

Not Responding image

You just need to add this: app.exec_() at the end of the code

Working fine

import sys
from PyQt4 import QtGui

app =  QtGui.QApplication(sys.argv)

window = QtGui.QWidget() 
window.setGeometry(50,50,500,300)
window.setWindowTitle("PyQt Ecuador")

window.show()
app.exec_()