code: def _open(self):
      #
      # read the OLE directory and see if this is a likely
      # to be a FlashPix file
  
      try:
          self.ole = olefile.OleFileIO(self.fp)
      except OSError as e:
          msg = "not an FPX file; invalid OLE file"
          raise SyntaxError(msg) from e
  
      if self.ole.root.clsid != "56616700-C154-11CE-8553-00AA00A1F95B":
          msg = "not an FPX file; bad root CLSID"
          raise SyntaxError(msg)
  
      self._open_index(1)
  
file_path: catboost/contrib/python/Pillow/py3/PIL/FpxImagePlugin.py
imports: import olefile
  from .None import Image, ImageFile
  from ._binary import i32le
label_desc: Use image node_id 1 for calling the FpxImageFile obj's underlying member method code with example usage: obj._open() without return types