def del_map(self, event, handle, *args):
        """
        Remove a mapping like event -(arg0, arg1, arg2, ...)-> handle.
        """
        if args:
            self.base[event].remove((handle, args))
        else:
            self.base[event] = [ind for ind in self.base[event] if ind[0] != handle]
Remove a mapping like event -(arg0, arg1, arg2, ...)-> handle.