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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get(self, key, **kw):
 """Retrieve a value from the cache. :param key: the value's key. :param \**kw: cache configuration arguments. The backend is configured using these arguments upon first request. Subsequent requests that use the same series of configuration values will use that same backend. """

        return self.impl.get(key, **self._get_cache_kw(kw, None))