Method as_instanceof_cause

python/ray/exceptions.py:245–276

Returns an exception that's an instance of the cause's class. The returned exception inherits from both RayTaskError and the cause class and contains all of the attributes of the cause exception. If the cause class can't be subclassed, issues a warning and returns `

(self)

        return cls(self.cause)

    def as_instanceof_cause(self):
        """Returns an exception that's an instance of the cause's class.

        The returned exception inherits from both RayTaskError and the
        cause class and contains all of the attributes of the cause
        exception.

        If the cause class can't be subclassed, issues a warning and returns `self`.
        """
        cause_cls = self.cause.__class__
        if issubclass(RayTaskError, cause_cls):
            return self  # already satisfied

        try:
            return self.make_dual_exception_instance()
        except TypeError as e:
            logger.warning(
                f"User exception type {type(self.cause)} in RayTaskError can't"
                " be subclassed! This exception is raised as"
                " RayTaskError only. You can use `ray_task_error.cause` to"
                f" access the user exception. Failure in subclassing: {e}"
            )
            return self
        except Exception as e:
            logger.warning(
                "Failed to combine RayTaskError with user exception type "
                f"{type(self.cause)}; raising RayTaskError only. This can "
                "happen when the user exception overrides attributes like "
                "`args` or otherwise blocks subclass construction. "
                f"Failure in subclassing: {e}"
            )
            return self

    def __str__(self):
        """Format a RayTaskError as a string."""