code: def _py_not(a):
      """Default Python implementation of the "not_" operator."""
      return not a
  
file_path: tensorflow/tensorflow/python/autograph/operators/logical.py
imports: from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import cond
  from tensorflow.python.ops import gen_math_ops
label_desc: Use image node_id 3 for calling a global function with example usage: _py_not(a) and returns: unknown