message: samples(dnn): avoid 'async' keyword (Python 3.7+)
diff: @@ -43,6 +43,7 @@ parser.add_argument('--target', choices=targets, default=cv.dnn.DNN_TARGET_CPU,
  '%d: OpenCL fp16 (half-float precision), '
  '%d: VPU' % targets)
  parser.add_argument('--async', type=int, default=0,
  + dest='asyncN',
  help='Number of asynchronous forwards at the same time. '
  'Choose 0 for synchronous mode')
  args, _ = parser.parse_known_args()
  @@ -231,8 +232,8 @@ def processingThreadBody():
  try:
  frame = framesQueue.get_nowait()
  - if args.async:
  - if len(futureOutputs) == args.async:
  + if args.asyncN:
  + if len(futureOutputs) == args.asyncN:
  frame = None # Skip the frame
  else:
  framesQueue.queue.clear() # Skip the rest of frames
  @@ -256,7 +257,7 @@ def processingThreadBody():
  frame = cv.resize(frame, (inpWidth, inpHeight))
  net.setInput(np.array([[inpHeight, inpWidth, 1.6]], dtype=np.float32), 'im_info')
  - if args.async:
  + if args.asyncN:
  futureOutputs.append(net.forwardAsync())
  else:
  outs = net.forward(outNames)
  