docs: def get_function_from_settings(settings_key):
      """Gets a function from the string path defined in a settings file.
  
      Example:
  
      # my_app/my_file.py
      def some_function():
          # do something
          pass
  
      # settings.py
      SOME_FUNCTION = 'my_app.my_file.some_function'
  
      > get_function_from_settings('SOME_FUNCTION')
      <function my_app.my_file.some_function>
      """
  
      renderer_func_str = getattr(settings, settings_key, None)
      if not renderer_func_str:
          return None
  
      module_str, renderer_func_name = renderer_func_str.rsplit('.', 1)
  
      try:
          mod = importlib.import_module(module_str)
          return getattr(mod, renderer_func_name)
      except Exception:
          return None