code: def _check_img_lib():
      """Utility to search for imageio or PIL"""
      # Import imageio or PIL
      imageio = PIL = None
      try:
          import imageio
      except ImportError:
          try:
              import PIL.Image
          except ImportError:
              pass
      return imageio, PIL
  
file_path: vispy/vispy/io/image.py
imports: import struct
  import zlib
  import numpy
label_desc: Use image node_id 6 for calling a global function with example usage: _check_img_lib() and returns: imageio,  PIL