code: def insert_or_test_version_number():
      """Should the format name and version number be inserted in text
      representations (not in tests!)"""
      return INSERT_AND_CHECK_VERSION_NUMBER
  
file_path: jupytext/src/jupytext/header.py
imports: import re
  import nbformat
  import yaml
  from nbformat.v4.nbbase import new_raw_cell
  from yaml.representer import SafeRepresenter
  from .languages import _SCRIPT_EXTENSIONS, comment_lines, default_language_from_metadata_and_ext
  from .metadata_filter import _DEFAULT_NOTEBOOK_METADATA, filter_metadata
  from .pep8 import pep8_lines_between_cells
  from .version import __version__
label_desc: Use image node_id 1 for calling a global function with example usage: insert_or_test_version_number() and returns: INSERT_AND_CHECK_VERSION_NUMBER