[PyQt] pyqt5.1 baffling exceptions: AttributeError: 'Qxxxxxx' object has no attribute 'QWidget'

[Stephen Gava]

On 07/10/13 19:07, Jens Persson wrote:
> This example runs without errors for me on Python2 in Linux.

ok, i should say these errors are occurring with pyqt5,1, qt5.1 python 
3.3 on 64bit linux.

>
> Greets Jens
>
> On Mon, Oct 7, 2013 at 2:27 AM, Stephen Gava <elguavas at gmail.com
> <mailto:elguavas at gmail.com>> wrote:
>
>
>     Phil, i've attached a simple test case that illustrates this
>     problem, here it is inline:
>
>     import sys
>
>     from PyQt5.QtWidgets import (QApplication,QMainWindow)
>
>     class MainWindow(QMainWindow):
>          def __init__(self):
>              super(MainWindow,self).__init____()
>              self.setWindowTitle('test case')
>              top_level_window=self.window()
>              print(top_level_window)
>
>     gui_app=QApplication(sys.argv)
>     gui_main_window=MainWindow()
>     gui_main_window.show()
>     sys.exit(gui_app.exec_())
>
>     the result of running the above is an exception:
>
>     builtins.AttributeError: 'MainWindow' object has no attribute 'QWidget'
>
>     with the traceback stopping in my code at the line where i try to
>     use the result of self.window() (by simply printing it).
>
>     if you comment out the print(top_level_window) the code runs fine so
>     the error happens when trying to _use_ the result of self.window()
>     in any way.
>
>     obviously MainWindow is already a top level window, so in the more
>     complex code where i'm getting these kind of errors the call to
>     QWindow.window() is ocurring in widget (sub)classes that belong to
>     the MainWindow.
>
>     as i said this error crops up in several places, but seemingly after
>     calls to either QWidget.window() or QWidget.childAt() in my code.
>     i'm hoping you find some general cause for this, but if you need it
>     i'll try to also come up with a simple case where it's triggered
>     after the childAt() call.
>
>     thanks,
>     stephen.
>