code: def test_activate_scalars(multiblock_poly):
      for block in multiblock_poly:
          data = np.array(["a"] * block.n_points)
          block.point_data.set_array(data, "data")
  
imports: import pathlib
  import platform
  import weakref
  import numpy
  import pytest
  import vtk
  import pyvista
  from pyvista import ImageData, MultiBlock, PolyData, RectilinearGrid, StructuredGrid, examples
label_desc: Use image node_id 41 for calling a global function with example usage: test_activate_scalars(multiblock_poly) without return types