<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def copy(self):
 """Make a copy of this instance. Copies the local data stored as simple types and copies the client attached to this instance. :rtype: :class:`~google.cloud.spanner_v1.instance.Instance` :returns: A copy of the current instance. """

        new_client = self._client.copy()
        return self.__class__(
            self.instance_id,
            new_client,
            self.configuration_name,
            node_count=self.node_count,
            display_name=self.display_name,
        )