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  1. Qt for Python
  2. PYSIDE-2282

QMainWindow and multiple inheritance from QWidget

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Details

    • Bug
    • Resolution: Out of scope
    • Not Evaluated
    • None
    • 6.5.2
    • PySide
    • None
    • macOS

    Description

      What was working in 6.4.x does not seem to be possible in 6.5.x. Running following code snippet:

      import sys

from PySide6.QtCore import QLibraryInfo, qVersion
from PySide6.QtWidgets import QApplication, QWidget, QMainWindow


class MyWidget(QWidget):
    pass


class Window(QMainWindow, MyWidget):
    def __init__(self):
        super().__init__()


if __name__ == '__main__':
    print('Python {}.{}'.format(sys.version_info[0], sys.version_info[1]))
    print(QLibraryInfo.build())
    app = QApplication(sys.argv)
    window = Window()
    window.setWindowTitle(qVersion())
    window.show()
    sys.exit(app.exec_())

      throws an exception and outputs the following:

      Python 3.10
Qt 6.5.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by Apple LLVM 14.0.0 (clang-1400.0.29.202)) [limited API]
Traceback (most recent call last):
  File "/Users/christianr/Documents/workspace/sett/sett/gui/Window.py", line 20, in <module>
    window = Window()
  File "/Users/christianr/Documents/workspace/sett/sett/gui/Window.py", line 13, in __init__
    super().__init__()
RuntimeError: You can't initialize an PySide6.QtWidgets.QMainWindow object in class Window twice!

      How can I fix this? Thanks in advance.

      Attachments

        1. pyside2282.py
          1 kB
          Friedemann Kleint

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. PYSIDE-1991 Multiple Inheritance segfault on PyPySide

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. PYSIDE-2397 RuntimeError when instantiating a class, which inherits multiple subclasses of a Qt class, some Pythonic, some Qt ones

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
          relates to

          Bug - A problem which impairs or prevents the functions of the product. PYSIDE-2654 Multiple inheritance with mixin class get TypeError in __init__

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. PYSIDE-1564 QObject does not support cooperative multiple inheritance

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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            People

              crmaurei Cristian Maureira-Fredes
              ribose Christian Ribeaud
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              Dates

                Created:
                Updated:
                Resolved:

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