class_docstr: Allows setting different environment variables in threads.
class_docstr_tok: ["Allows","setting","different","environment","variables","in","threads","."]
code: def __setitem__(self, name, value):
      self._setup_thread()
      self.thread_local.environ[name] = value
  
file_path: keras-tuner/keras_tuner/test_utils/mock_distribute.py
imports: import os
  import sys
  import threading
  from unittest import mock
  import portpicker
  import six
label_desc: Use image node_id 4 for calling the MockEnvVars obj's underlying member method code with example usage: obj.__setitem__(name, value) without return types