code: def register_handler(handler):
      """
      Install application-specific HDF5 image handler.
  
      :param handler: Handler object.
      """
      global _handler
      _handler = handler
  
file_path: catboost/contrib/python/Pillow/py3/PIL/Hdf5StubImagePlugin.py
imports: from .None import Image, ImageFile
label_desc: Use image node_id 1 for calling a global function with example usage: register_handler(handler) without return types