Python 设计模式: 适配器模式(adapter pattern)

在不修改原对象代码的基础上，把对象的不兼容接口封装成调用者需要的兼容接口即为适配器模式。比如新代码要对接老代码，但是又不想修改老代码，可以使用适配器模式将老代码封装为新代码需要的接口。

比如:

class QiniuClient:
    def __init__(self, ...):
        self._client = Qiniu(...)

    def get_content(self, path):
        content = self._client.get(path, ...)
        return content


class OSSClient:
    def __init__(self, ...):
        self._client = OSS(...)

    def get_content(self, path):
        content = self._client.get_data(path, ...)
        return content

def download(client, remote_path, local_path):
    with open(local_path, 'wb') as fp:
        content = client.get_content(remote_path)
        fp.write(content)

client = OSSClient(...)
download(client, '/hello/world.json', 'hello.json')

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