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Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 5.15.4, 6.3.0
Component/s: PySide, Shiboken
Labels:
None
Environment:
Python 3.10
PySide6 6.3.0
shiboken6 6.3.0
Linux

Commits:
d58e262b11 (pyside/pyside-setup/dev) 5ed3e6f5dd (pyside/pyside-setup/6.3) bdfd9e0a50 (pyside/pyside-setup/6.4) 5ed3e6f5dd (pyside/tqtc-pyside-setup/6.3) bdfd9e0a50 (pyside/tqtc-pyside-setup/6.4) bdfd9e0a50 (pyside/tqtc-pyside-setup/tqtc/6.4)

Defining __slots__ in a PySide subclass segfaults on attribute assignment

from PySide6.QtCore import QObject


class Obj(QObject):
    __slots__ = ("a",)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.a = 1  # <<< segfaults here


obj = Obj()

Note: the __slots__ is python feature unrelated to Qt's signal/slot mechanism.

https://docs.python.org/3/reference/datamodel.html?highlight=__slots__#object.__slots__