text: import grpc
  
  # import the generated classes
  import calculator_pb2
  import calculator_pb2_grpc
  
  # open a gRPC channel
  channel = grpc.insecure_channel('localhost:50051')
  
  # create a stub (client)
  stub = calculator_pb2_grpc.CalculatorStub(channel)
  
  # create a valid request message
  number = calculator_pb2.Number(value=16)
  
  # make the call
  response = stub.SquareRoot(number)
  
  # et voilà
  print(response.value)