code: def notebook_metadata():
      return {
          "kernelspec": {
              "display_name": "Python 3",
              "language": "python",
              "name": "python3",
          },
          "language_info": {
              "codemirror_mode": {"name": "ipython", "version": 3},
              "file_extension": ".py",
              "mimetype": "text/x-python",
              "name": "python",
              "nbconvert_exporter": "python",
              "pygments_lexer": "ipython3",
              "version": "3.7.3",
          },
          "toc": {
              "base_numbering": 1,
              "nav_menu": {},
              "number_sections": True,
              "sideBar": True,
              "skip_h1_title": False,
              "title_cell": "Table of Contents",
              "title_sidebar": "Contents",
              "toc_cell": False,
              "toc_position": {},
              "toc_section_display": True,
              "toc_window_display": False,
          },
      }
  
imports: import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook, new_raw_cell
  from jupytext.compare import NotebookDifference, compare, compare_cells, compare_notebooks
  from jupytext.compare import test_round_trip_conversion
label_desc: Use image node_id 1 for calling a global function with example usage: notebook_metadata() and returns: dict