def METHOD_NAME(self, instrumentation_key):
    if not instrumentation_key:
        return None
    if instrumentation_key not in self._clients:
        # In the original implementation there is a line of code enable the exception hook. Removed.
        # enable(instrumentation_key)
        channel = TelemetryChannel(queue=SynchronousQueue(self._sender()))
        client = TelemetryClient(instrumentation_key=instrumentation_key, telemetry_channel=channel)
        self._clients[instrumentation_key] = client
    return self._clients[instrumentation_key]