code: def dumps(self, item):
      return pickle.dumps(item, self.proto)
  
file_path: catboost/contrib/tools/python/src/Lib/ctypes/test/test_pickling.py
imports: import unittest
  import pickle
  from ctypes import *
  import _ctypes_test
label_desc: Use image node_id 1 for calling the PickleTest obj's underlying member method code with example usage: obj.dumps(item) and returns: pickle