class_docstr: Helper substitute for contextlib.nullcontext.
class_docstr_tok: ["Helper","substitute","for","contextlib.nullcontext","."]
code: def __exit__(self, unused_type, unused_value, unused_traceback):
      pass
  
imports: import enum
  import inspect
  import threading
  from nvidia.dali._autograph.utils import ag_logging
  from nvidia.dali._autograph.utils.all_utils import export_symbol
label_desc: Use image node_id 2 for calling the NullCtx obj's underlying member method code with example usage: obj.__exit__(unused_type, unused_value, unused_traceback) without return types