code: def test_nbformat_v3_nbpy_cell(
      script="""# <codecell>
  print('Hello')
  """,
  ):
      nb = jupytext.reads(script, "py")
      script2 = jupytext.writes(nb, "py:hydrogen")
      expected = """# %%
  print('Hello')
  """
      compare(script2, expected)
  
file_path: jupytext/tests/functional/simple_notebooks/test_read_simple_hydrogen.py
imports: import jupytext
  from jupytext.compare import compare
label_desc: Use image node_id 7 for calling a global function with example usage: test_nbformat_v3_nbpy_cell(script) without return types