from __future__ import annotations
import abc
from PySide6 import QtCore

class MixinMeta(type(QtCore.QObject), abc.ABCMeta):  # type: ignore
    pass

class CompareView(metaclass=MixinMeta):    def __init__(self, parent: QtCore.QObject=None):
        pass
    @abc.abstractmethod
    def update_view(self) -> None:
        raise NotImplementedError()
 

[08:42 simon@simonlaptop local :)] python test_pyside.py 
corrupted size vs. prev_size
Aborted (core dumped) 

[08:49 simon@simonlaptop local :)] python test_pyside.py 
free(): corrupted unsorted chunks
Aborted (core dumped)