code: def next_(iterator, default=UNSPECIFIED):
      next_override = registry_lookup(next_registry, iterator)
      if next_override is not None:
          return next_override(iterator, default)
      return next_py(iterator, default)
  
imports: import inspect
  from tensorflow.python.autograph.utils import tensors
  from tensorflow.python.autograph.utils import type_registry
  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 control_flow_assert
  from tensorflow.python.ops import gen_parsing_ops
  from tensorflow.python.ops import gen_string_ops
  from tensorflow.python.ops import list_ops
  from tensorflow.python.ops import math_ops
label_desc: Use image node_id 39 for calling a global function with example usage: next_(iterator, default) and returns: next_py, next_override