import ctypes


class ParentStructure(ctypes.Structure):
    def __init_subclass__(cls, **kwargs):
        cls._fields_ =[('v1',ctypes.c_uint),('v2',ctypes.c_uint),]
        super().__init_subclass__(**kwargs)


class ChildStructure(ParentStructure):
    pass

Traceback (most recent call last):
  File "D:\Projects\pythonProject\main.py", line 10, in <module>
    class ChildStructure(ParentStructure):
  File "D:\Projects\pythonProject\main.py", line 6, in __init_subclass__
    cls._fields_ =[('v1',ctypes.c_uint),('v2',ctypes.c_uint),]
SystemError: error return without exception set