Class cls

python/ray/exceptions.py:179–201

        error_msg = str(self)

        class cls(RayTaskError, cause_cls):
            def __init__(self, cause):
                self.cause = cause
                # Store args separately to avoid writing to user-defined
                # read-only or property-based `args`.
                self._ray_task_error_args = (cause,)

            @property
            def args(self):
                return self._ray_task_error_args

            @args.setter
            def args(self, value):
                self._ray_task_error_args = value

            def __reduce__(self):
                return (cls, self._ray_task_error_args)

            def __getattr__(self, name):
                return getattr(self.cause, name)

            def __str__(self):
                return error_msg

        name = f"RayTaskError({cause_cls.__name__})"
        cls.__name__ = name