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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 role(self):
 """Return the role of the server instance. Returns named tuples describing role of the instance. For fields information see http://redis.io/commands/role#output-format """

        fut = self.execute(b'ROLE', encoding='utf-8')
        return wait_convert(fut, parse_role)