text: create python3 scalar script dob_1i_1o(x double) emits(y double)
  as
      def run(ctx):
          ctx.emit(ctx.x)
          ctx.emit(ctx.x)
  /
  create python3 scalar script line_1i_1o(x double) emits(y double)
  as
      def run(ctx):
          ctx.emit(ctx.x)
  /
  create python3 scalar script line_1i_2o(x double) emits(y double, z double)
  as
      def run(ctx):
          ctx.emit(ctx.x, ctx.x)
  /
  create python3 scalar script line_2i_1o(x double, y double) emits(z double)
  as
      def run(ctx):
          ctx.emit(ctx.x + ctx.y)
  /
  create python3 scalar script line_3i_2o(x double, y double, z double) emits(z1 double, z2 double)
  as
      def run(ctx):
          ctx.emit(ctx.x + ctx.y, 3000)
  /
  