hub.py 文件源码

def handle_error(self, context, type, value, tb):
        """
        Called by the event loop when an error occurs. The arguments
        type, value, and tb are the standard tuple returned by :func:`sys.exc_info`.

        Applications can set a property on the hub with this same signature
        to override the error handling provided by this class.

        Errors that are :attr:`system errors <SYSTEM_ERROR>` are passed
        to :meth:`handle_system_error`.

        :param context: If this is ``None``, indicates a system error that
            should generally result in exiting the loop and being thrown to the
            parent greenlet.
        """
        if isinstance(value, str):
            # Cython can raise errors where the value is a plain string
            # e.g., AttributeError, "_semaphore.Semaphore has no attr", <traceback>
            value = type(value)
        if not issubclass(type, self.NOT_ERROR):
            self.print_exception(context, type, value, tb)
        if context is None or issubclass(type, self.SYSTEM_ERROR):
            self.handle_system_error(type, value)