code: def load_tests(loader, tests, pattern):
      tests.addTest(doctest.DocTestSuite(pickletools))
      return tests
  
file_path: cpython/Lib/test/test_pickletools.py
imports: import pickle
  import pickletools
  from test import support
  from test.pickletester import AbstractPickleTests
  import doctest
  import unittest
label_desc: Use image node_id 1 for calling a global function with example usage: load_tests(loader, tests, pattern) and returns: tests