code: def _py_list_append(list_, x):
      """Overload of list_append that executes a Python list append."""
      # Revert to the original call.
      list_.append(x)
      return list_
  
imports: import collections
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import cond
  from tensorflow.python.ops import list_ops
  from tensorflow.python.ops import tensor_array_ops
label_desc: Use image node_id 8 for calling a global function with example usage: _py_list_append(list_, x) and returns: list_