Created
October 12, 2017 01:59
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代理模式 属性访问控制
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| class FileStorage(object): | |
| def __init__(self, stream, **kwargs): | |
| self.stream = stream | |
| def __getattr__(self, name) | |
| return getattr(self.stream, name) |
__getattr__ 和 __setattr__ 解析:
__getattr__: 当实例属性和类的属性没有找到时调用, 能找就不调用, 方法计算属性或者抛出 AttributeError异常
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简单的代理模式只需要实现
__getattr__方法, 使调用落到被代理对象上