QMessageBox.question returns NoButton in python interactive

Greetings,
I have found that when calling QMessageBox.question, the message box
flashes up briefly before disappearing and the call returns NoButton. This
behavior is present in both PyQt4 and PyQt5 (most recently tested on 5.9.2
from anaconda package), on windows (but not linux), and only if I have not
called QApplication.exec_() because I am running in an interactive python
shell.

Code to reproduce (run with python -i):

import sys
#from PyQt4 import QtGui as QtWidgets
from PyQt5 import QtWidgets

app = QtWidgets.QApplication([])

def msg():
   print(QtWidgets.QMessageBox.question(btn, "title", "message"))

btn = QtWidgets.QPushButton("show messagebox")
btn.clicked.connect(msg)
btn.show()

# message box works if event loop is started
# app.exec_()


Cheers,
Luke

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