Raise exception by name.

def _raise_exception(self, eobj, edata=None):
        """Raise exception by name."""
        _, _, tbobj = sys.exc_info()
        if edata:
            emsg = self._format_msg(eobj["msg"], edata)
            _rwtb(eobj["type"], emsg, tbobj)
        else:
            _rwtb(eobj["type"], eobj["msg"], tbobj)