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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 _datastore_api(self):
 """Getter for a wrapped API object."""

        if self._datastore_api_internal is None:
            if self._use_grpc:
                self._datastore_api_internal = make_datastore_api(self)
            else:
                self._datastore_api_internal = HTTPDatastoreAPI(self)
        return self._datastore_api_internal