code: def nb_plot():
      content = """
  import matplotlib.pyplot as plt
  
  # + tags=["a"]
  plt.plot([1, 2, 3], [1, 2, 3])
  
  # + tags=["b"]
  42
  """
      save_notebook(content, "nb_plot.ipynb")
  
file_path: sklearn-evaluation/tests/nb/conftest.py
imports: from pathlib import Path
  import jupytext
  import nbformat
  import papermill
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: nb_plot() without return types