class_docstr: Helper substitute for contextlib.nullcontext.
class_docstr_tok: ["Helper","substitute","for","contextlib.nullcontext","."]
code: def __enter__(self):
      pass
  
imports: import enum
  import inspect
  import threading
  from tensorflow.python.autograph.utils import ag_logging
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 1 for calling the NullCtx obj's underlying member method code with example usage: obj.__enter__() without return types