code: def setUpClass(cls):
      cls.tokenizer: PLBartTokenizer = PLBartTokenizer.from_pretrained(
          cls.checkpoint_name,
          language_codes="base",
          src_lang="python",
          tgt_lang="en_XX",
      )
      cls.pad_token_id = 1
      return cls
  
imports: import tempfile
  import unittest
  from transformers import SPIECE_UNDERLINE, BatchEncoding, PLBartTokenizer, is_torch_available
  from transformers.testing_utils import get_tests_dir, nested_simplify, require_sentencepiece, require_tokenizers, require_torch
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 1 for calling the PLBartPythonEnIntegrationTest obj's underlying member method code with example usage: obj.setUpClass(cls) and returns: cls