最近在看 uiautomator 的 Python 封装，代码中使用 param_to_property 的装饰器，就可以实现
d.open.notification()，这样的转换不知该如何理解。
google 了一天了，帮小弟解惑，谢谢啦

def param_to_property(*props, **kwprops):
    if props and kwprops:
        raise SyntaxError("Can not set both props and kwprops at the same time.")

    class Wrapper(object):

        def __init__(self, func):
            self.func = func
            self.kwargs, self.args = {}, []

        def __getattr__(self, attr):
            if kwprops:
                for prop_name, prop_values in kwprops.items():
                    if attr in prop_values and prop_name not in self.kwargs:
                        self.kwargs[prop_name] = attr
                        return self
            elif attr in props:
                self.args.append(attr)
                return self
            raise AttributeError("%s parameter is duplicated or not allowed!" % attr)

        def __call__(self, *args, **kwargs):
            if kwprops:
                kwargs.update(self.kwargs)
                self.kwargs = {}
                return self.func(*args, **kwargs)
            else:
                new_args, self.args = self.args + list(args), []
                return self.func(*new_args, **kwargs)
    return Wrapper
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@property    
def open(self):
        '''
        Open notification or quick settings.
        Usage:
        d.open.notification()
        d.open.quick_settings()
        '''
        @param_to_property(action=["notification", "quick_settings"])
        def _open(action):
            if action == "notification":
                return self.server.jsonrpc.openNotification()
            else:
                return self.server.jsonrpc.openQuickSettings()
        return _open