code: def open_instance_resource(self, path: FilePath, mode: str='rb') -> IO[AnyStr]:
          
          return open(self.instance_path / file_path_to_path(path), mode)
docs: Open a file for reading.
  
          Use as
  
          .. code-block:: python
  
              with app.open_instance_resouce(path) as file_:
                  file_.read()