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Description
example 19-5 FrozenJSON
def __init__(self, mapping):
        self.__data = dict(mapping)  ➊
    def __getattr__(self, name):  ➋
        if hasattr(self.__data, name):
            return getattr(self.__data, name)  ➌
        else:
            return FrozenJSON.build(self.__data[name])  ➍
self.__data is a dict ,function hasattr(object, name) the first parameter is object,so hasattr(self.__data, name) always return False,so step ➌ never return . am i right?