class_docstr: No-op context manager.
code: def __enter__(self):
      return None
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import contextlib
  import copy
  import os
  import tensorflow
label_desc: Use image node_id 1 for calling the NoOpScope obj's underlying member method code with example usage: obj.__enter__() and returns: None