def execute(self, args):
        """Execute a registered hook based on args[0]"""
        _run_atstart()
        hook_name = os.path.basename(args[0])
        if hook_name in self._hooks:
            try:
                self._hooks[hook_name]()
            except SystemExit as x:
                if x.code is None or x.code == 0:
                    _run_atexit()
                raise
            _run_atexit()
        else:
            raise UnregisteredHookError(hook_name)
Execute a registered hook based on args[0]