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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 ready(self):
 """Indicates that the client is connected to the Redis server or cluster and is ready for use. :rtype: bool """

        if self._clustering:
            return (all([c.connected for c in self._cluster.values()])
                    and len(self._cluster))
        return (self._connection and self._connection.connected)