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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_client(self):
 """ Retrieves or creates a client instance from this configuration object. If instantiated from this configuration, the resulting object is also cached in the property ``client`` and a reference to this configuration is stored on the client object. :return: Client object instance. :rtype: docker.client.Client """

        client = self._client
        if not client:
            self._client = client = self.client_constructor(**self.get_init_kwargs())
            client.client_configuration = self
            # Client might update the version number after construction.
            updated_version = getattr(client, 'api_version', None)
            if updated_version:
                self.version = updated_version
        return client