def add_exception_type(self, exc):
        r"""Adds an exception type to be handled during the reconnect logic.

        By default the exception types handled are those handled by
        :meth:`discord.Client.connect`\, which includes a lot of internet disconnection
        errors.

        This function is useful if you're interacting with a 3rd party library that
        raises its own set of exceptions.

        Parameters
        ------------
        exc: Type[:class:`BaseException`]
            The exception class to handle.

        Raises
        --------
        TypeError
            The exception passed is either not a class or not inherited from :class:`BaseException`.
        """

        if not inspect.isclass(exc):
            raise TypeError('{0!r} must be a class.'.format(exc))
        if not issubclass(exc, BaseException):
            raise TypeError('{0!r} must inherit from BaseException.'.format(exc))

        self._valid_exception = (*self._valid_exception, exc)