code: def _iter_notebook_source(nb_data):
      for cell in nb_data.get("cells", []):
          if cell.get("cell_type") == "code":
              yield "".join(cell.get("source", []))
  
imports: import ast
  import json
  import logging
  import os
  import re
  from guild import config
  from guild import guildfile
  from guild import model
  from guild import plugin
  from guild import python_util
  from guild import util
  from .None import flags_import_util
label_desc: Use image node_id 19 for calling a global function with example usage: _iter_notebook_source(nb_data) without return types