Examples of dynamic exceptions

dynamic_exceptions.py

if not abstract:
    new_class.add_to_class(
        'DoesNotExist',
        subclass_exception(
            'DoesNotExist',
            tuple(
                x.DoesNotExist for x in parents if hasattr(x, '_meta') and not x._meta.abstract
            ) or (ObjectDoesNotExist,),
            module,
            attached_to=new_class))

    new_class.add_to_class('_meta', Options(meta, app_label))

new_class.add_to_class(
    'MultipleObjectsReturned',
    subclass_exception(
        'MultipleObjectsReturned',
        tuple(
            x.MultipleObjectsReturned for x in parents if hasattr(x, '_meta') and not x._meta.abstract
        ) or (MultipleObjectsReturned,),
        module,
        attached_to=new_class))