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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 close(self, autocommit=True):
 """Close the consumer, waiting indefinitely for any needed cleanup. Keyword Arguments: autocommit (bool):
 If auto-commit is configured for this consumer, this optional flag causes the consumer to attempt to commit any pending consumed offsets prior to close. Default: True """

        if self._closed:
            return
        log.debug("Closing the KafkaConsumer.")
        self._closed = True
        self._coordinator.close(autocommit=autocommit)
        self._metrics.close()
        self._client.close()
        try:
            self.config['key_deserializer'].close()
        except AttributeError:
            pass
        try:
            self.config['value_deserializer'].close()
        except AttributeError:
            pass
        log.debug("The KafkaConsumer has closed.")