[Bug 1312857] Re: Not constructing a QApplication before a QPaintDevice leads to core dumo

[Scott Kitterman]

"QWidget: Must construct a QApplication before a QPaintDevice" is the
key.  That's a Qt error message telling you your code is wrong.  Not
PyQt specific.

** Changed in: python-qt4 (Ubuntu)
       Status: New => Invalid

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Title:
  Not constructing a QApplication before a QPaintDevice leads to core
  dumo

Status in “python-qt4” package in Ubuntu:
  Invalid

Bug description:
  I was playing with PyQt4.

  1) Made a file named P2.py with
  #!/usr/bin/python
  # -*- coding: utf-8 -*-

  import sys
  from PyQt4 import QtGui 

  class P2(QtGui.QWidget):
      def __init__(s):
          super(P2,s).__init__()
  #        print ">>>> dir(P2):", dir(P2)
          print "is initUI in dir()?", 'initUI' in dir()
          s.initUI()

      def initUI(s):
          s.setGeometry(300, 300, 250, 150)
          s.setWindowTitle('Icon')
          s.setWindowIcon(QtGui.QIcon('web.png'))        
          s.show()


  2) Started python interpreter
  3) Inside python I gave the following commands
  >>> import P2
  >>> q=P2.P2()
  with the following result

  QWidget: Must construct a QApplication before a QPaintDevice
  Aborted (core dumped)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: python-qt4 4.10.4+dfsg-1ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Fri Apr 25 19:37:57 2014
  InstallationDate: Installed on 2012-02-18 (796 days ago)
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  SourcePackage: python-qt4
  UpgradeStatus: Upgraded to trusty on 2014-04-20 (4 days ago)

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